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Friday, July 02, 2010

Overclocking Your Pentax (AA Battery) DSLR(s)!?

See this experiment done by a K200D guy for the physical and performance differences found and measured when using different battery types:-

http://www.dchome.net/viewthread.php?tid=883911
(in Traditional Chinese, Google translated English page here)

So, his comparisons and results are tabulated:-

Battery Type:
NiMH (Sanyo 2500 mAh)
AA Lithium (Energizer)NiZn (PowerGenix)
Total Weight
(4 x AAs):
115g
98g (85%)
58g (50%)
AF Motor Speed
(from 00 to nearest w/ DA 16-45)
0.316s
0.254 (80%)
0.211s (67%)
Voltage (Per Cell):
1.38V (-8% Lower than the Designed 1.50V Nominal Voltage)
1.72V (+15% Higher)
1.78V (+19% Higher)

So, it is clear that the NiZn wins all, it is lighter and yet more powerful. But this may also be too powerful for the Pentax AA DSLRs to tolerate, as the voltage might be too high and more importantly, the internal resistance of the NiZn is just too low, this may put some electronics and components inside our cameras at risk, in particular the built-in flash, I bet - Read my this previous article for more details:-

Better K-x Rechargable Solution? Is the NiZn Safe?

Anyway, if you hate much the NiMH battery performance and reliability in your Pentax AA battery DSLR(s) (I DO), and if you might want to overclock your DSLR(s) for better performance, you may give the NiZn a trial. But remember, do this at your own risk and you might get your camera burnt and damaged in the end!

P.S. Recently when I did some prolonged movie recording (which was just for a few minutes continuously for each clip and then clip after clip, air-conditioned indoor) with my K-x with fully-charged NiMHs in it, it quitted and left the "LiveView" mode a few times prematurely without any warning. The battery indicator changed from green to yellow (half-depleted) and then to red (fully depleted) and back to green after enough rest! This is really annoying as I found that when I did the same with the Canon 550D, even under a hot sun and high temperature outdoor, and for even longer recording time, no problem ever happened! That AA battery rechargeable "solution" used by Pentax in any Pentax AA DSLR does really SUCK, I have to say! >:-( It's just now an unique Pentax problem anyway, for the current lines and models of DSLRs that are in the market.


Read Also:-


AA Battery Chargers Fully Compared (4 Models)

Thursday, July 01, 2010

550D Full Review, Tips and Tricks

1. Performance and Characteristics

Build and Feel, Ergonomics, etc.:

It actually feels rather plasticky and cheap for the materials used for the outer shell of the 550D, as this holds true for any Canon entry level DSLRs ever made anyway. Putting aside for that really cheapo feel of it, the build quality and workmanship of the 550D is actually not bad, or, I would say it is really good actually. At least the closed built-in flash can be closed tightly and there is no play. I had inspected three different units of the 550D from different persons and all units are well built. So, it is not a coincidence. All 550D bodies are made in Japan, when it is compared to those Nikon DSLRs that are made in Thailand, including the D300s and D700 (and below), the 550D actually have just tighter design and QC tolerance in some areas, e.g., I have never seen a D700 that its closed built-in flash is tight and without large play, which is a real annoyance, at least to me! :-o

Holding the camera is indeed secure and comfortable, there are anti-slipping rubber at both the thumb position at the body back and at the grip front, which is better than the K-x, as the K-x has no rubber at the thumb position, unlike the K-7 (which has it).

Operation Interface and User-Friendliness:

Coincidently, the designed operation interface of the 550D is 90% similar to that of the K-x but I would say K-x' is a bit more refined and thoughtful, for both the software and hardware, which is somehow better. Just say the mode dial of the K-x can be turned in a cyclic way but 550D's cannot. And, the worst thing is that the Movie and the PASM mode positions are located too far apart on the 550's mode dial so that everytime when switch between those still picture shooting modes and the Movie mode, it is rather inconvenient. To give you a better idea for what I am saying, I took two pictures of the mode dials of the two cameras, see below:



Viewfinder:

I felt that it is just a bit smaller and less bright than the K-x' one. Well there are "red dots" for the AF point indication, but I don't like its cheap representation and appearance, i.e., the dots and red light are blur and dim as projected. Yet fortunately, the green numeric display at the bottom is bright, large and easy to read. It is both larger and brighter than the K-x' and thus could be read better under bright sunlight outdoor.

Metering Accuracy:

I'm totally not impressed with Canon's new 63 x 2 segment metering system used in the 550D. It is not so consistent and reliable as I originally expected from what the specifications tell and such an advanced and latest design would give for the results. It overexposes and underexposes more than the plain old villa Centre-Weighted Average (CWA) metering mode in many more difficult and non-standard situations. I could confirm this and quite sure for my this conclusion and comment as I had experience the first week I used the camera. The new evaluative system does tend to overexpose the subjects, even for normal and typical scenes which should not be a problem even for traditional CWA metering. Despite what it is claimed and marketed by Canon, the new system is still colour-blinded to darker green objects which has a low reflectance and hence more overexposure would result. So, I just gave up and switch to the CWA, which is more stable, reliable and accurate, although it has no intelligence of any. Although the CWA is "stupid" but it is just predictable - a very importance thing for controllable metering and exposure. In fact, I found the 16-segment evaluative metering of my K-x does a better job than the 550D and so does the old 35-segment system of my old 5D. Well, after all, big disappointment here - it seems that all entry level Canon DSLRs have never been able to give more accurate metering without blowing the highlights! :-( And the worst thing is that most of the time powerful specifications just mean *nothing* against what they actually perform! That is, those advanced systems are unbeatable on paper but in the field they just suck! :-o :-(

Well, if it is not just that the evaluative metering system of the 550D is just worst than that of my K-x', I might buy one myself actually! :-)

Colour Response:

Choosing a colour-accurate Picture Style is always a headache with Canon DSLRs from my practical experiences over years, this is true no matter with my old and really expensive 5D and now up to the 550D. Sometimes I just wonder what is going on with Canon's engineers! The Faithful PS has never been anything *faithful* and neither does the Neutral Mode. Not Portrait Mode in any Canon DSLR that I can use to do portraiture and the skin tone representation are terrible! I would rather Portrait PS of Canon DSLRs to shoot landscape to get better results for another application! Yet fortunately, I still found that this time the Standard Mode of the 550D is actually colour-accurate and produces more favourable colours to my like, despite that it has (much) higher contrast and higher saturation by default than reality. So, I just tuned down both by one step. After that, the contrast and colour are still a bit more when compared to real-life but it is fairly good and close enough. Sometimes, we want to eat some MSG, right? Maybe a little bit of the MSG is good and do not big harm? ;-) The skin tone reproduction with this setting is yet found to be fairly good, and is far better than what the Portrait, Neutral and Faithful could do, IMHO (but which is ridiculous, also).

Then, one may wonder if downloading additional Picture Styles from the Canon websites (or anywhere btw) would help. Unfortunately, I found that the old PSes just won't work well on new digital EOS bodies! :-( Just say, the Portrait Snapshot and Portrait Studio both work quite well in my 5D with L lenses, but in the 550D all colours and even the reproduced contrast are in a mess and the outcome and colours/tones/contrast/lightness response are all very strange! So, I gave up again!

It just seems that the old Picture Styles were just calibrated and built with particular camera bod(ies) and lens(es), the profiles are actually not much portable although software-wise it is compatible and can be loaded.

Below are some screen captures of uploading Picture Style Files into the camera via the latest EOS Utility (Version 2.8):



Anyway, I do like the colours reproduced by the 550D for my above PS and settings chosen (i.e., Standard 2, -1, -1, 0). Do note that I've tuned down the "Sharpness" (actually it is just digital sharpening/unsharp masking) one step down to "2" also, as I think this is the best compromise between sharpness and sharpening artifacts. And, I found that with the proper settings of the above, the colours rendered by the 550D is more solid than what my K-x could do, which I do quite like indeed.

To fine tune the Picture Style settings, go into the second tab of the set-up menu, choose the picture style and press the "DISP" for detailed settings:



(Auto) White Balance:

I have no complaint with the WB, no matter sunny or cloudy outdoor, fluorescent or tungsten indoor. I believe you can judge this with the samples I post in the samples gallery below. It does not usually adjust the colour temperature in a "the Whiter is Better" way. but it does reproduce images that look close enough to what my eyes could see for most situation. Three examples shot:-



(Click to Enlarge: The Water Melon shot was taken indoor at a supermarket with mixed yellow and white fluorescent lighting and under shadow! Amazing?! The food shots are under tungsten lighting, the mussel shot was at ISO 3200 (which I accidentally selected, the grilled chicken was taken in a dimmer condition at ISO 1600.)

Dynamic Range:

With the default PS and "colour" settings, the DR suffers and the range is limited. I did some side-by-side tests and found that the DR is just improved with contrast and saturation to be set one step lower, as just have been mentioned above. Anyway, I found that my K-x seems to have a slightly wider DR for the set of optimal settings that I chose for it .

Resolution / General Image Quality:

The resolution of the 550D is very high, especially when using ISO speeds at 400 or below. The per pixel sharpness is very good and the image formation is solid, better than the K-x indeed.

Lens Quality:

The kit lens is in fact quite sharp, especially when it is stopped down, and it is acceptable wide opened, provided that the focusing (AF) is accurate. This is against what many Cananians misbelieve that the kit lens is a piece of junk, which I don't think so and totally disagree with. In fact, I found that the corner sharpness of the kit could be even better than my 17-40L at the same stopped down aperture and at the widest side, say, at 18mm f/8. After all, the general image quality of the 550D standard kit set is very high, as you can verify this with my posted large samples in the "Samples" section below.

The flare control is somehow crappy, though. See this example, there is a bright background but the sun is just even not in the frame, but the outcome suck somehow! :-(


(Click to Enlarge)

Frankly, the flare control weakness could be true for most Canon lenses, even for those expensive L lenses. As far as flare resistance is concerned, Canon lenses in general cannot match with nor even come close to Pentax lenses, which really shine with their SMC coatings, especially the Ghostless edition(s).

High ISO Performance:

High ISO image quality is good after I set "High ISO NR" to "Low" than the default middle strength setting, so as to retain more the subject details. With the "Low" NR setting, the noise is still acceptable IMO. If I have to choose between any (more) loss of details and to live with some more noise, it is just a no-brainer. See this example, the noise/details is in compromise, I believe:-


(Click to Enlarge)

In fact, I found that the noise handling of the 550D seems to be more advanced and mature than what the K-x could do. The K-x eliminate noise with the image and details "dissolved" altogether which is just more destructive. In contrast, the 550D does have better noise structure at high ISO speeds, with the Low NR setting. Last but not least, also don't forget the 550D has an 18MP pixel count, which is 50% more than the K-x, which has 12MPs only.

IS Performance:

See also the above example shot, which was made handheld at 1/10s. I think the IS does perform well with the kit lens and it does do its job. The film equivalent angle-of-view is 29mm, with an actual focal of 18mm, i.e., 18 x 1.6.

Focusing Speed and Accuracy:

As with any Canon DSLRs, I found that the AF speed and performance is just a non-issue which is just more than adequate for typical shooting requirements for average users. It is fast and decisive for most of the cases. In case of low light conditions, there are still some huntings and the focusing accuracy drops. This applies well for most entry level to mid-grade bodies, anyway. Nevertheless, I did find that even under bright conditions with contrasty objects, the AF of the 550D could still be be occasionally out, although the errors were small.

System Performance:

The shutter/mirror lag of the 550D is typical Canon entry level performance, which is not too quick nor too slow, which I found to be acceptable for general shootings. The mirror action is yet gentle and is far better than my K-x which should have more mirror vibration and felt coarse. In fact, the mirror/shutter action of the 550D felt much like my MZ-S, which is much refined, although the shutter lag is not particular shorter with quicker response. On the other hand, the K-x seems to have a slightly shorter shutter lag but it is more vigorous. On the other hand, the 550D does not have a high frame rate and in practical use, there is a clear difference, i.e., the K-x is faster. The 550D has more total number of burst in a chain, though, and the K-x has less.

LiveView:

LV Contrast-Detection AF of the 550D is now faster and somehow improved than previous models and upper model as well, i.e., the 5D MkII. Whilst it is faster, sometimes it would still miss the target and hunt back as the AF system itself by no means knew that where it should go and would go! I think its speed is somehow in between the Pana GF1 and the K-x (which just acts like the old 450D of Canon and is slower).

Below you can see a demo of the CDAF under the LV mode of the 550D, you can compare this against the CDAF of the K-x in my previous K-x full review for the speed difference (besides, you can hear the shutter sound at the end):


(URL: http://www.youtube.com/watch?v=aZIeUG0zq5k)

As I have been saying for long, the LV is actually a welcome and useful feature. It opens up more opportunities in framing and shooting. See the pair of example shots below, I just could not come closer if I had to use the optical finder for framing or that I had to guess. With the LV, I was able to get a better shot, at the a closer focusing distance, the kit lens was set at its longest reach of 55mm, already:


(Left: No LV; Right: Using LV - Click to Enlarge)

Besides, as you can see from the above, the bokeh of the kit lens is actually very nice.

Movie Recording:

The H.264 compression format has one advantage of saving memory space but it creates many problems as a result of the compression. First of all, Windows and Windows Media Player (even the latest version of 11) does not have the specific Codec for decoding the movie by default. In order to playback the movie, one has to install QuickTime player version 7 or above. For smooth playback of just a standard HD 720p video, the hardware processing power requirement is high and for Full HD 1080p videos, the processing power requirement is ridiculously huge. In contrast, whilst the Motion JPEG (the only format as adopted by the Pentax DSLRs) is large in size for the recorded videos, there is no compression and loss in video image quality and most important, playback is much easier for most machines and it is more old-machine friendly. Very unfortunately, there is no option for the 550D for the user to select to record movie in Motion JPEG. On the other hand, the Pana GF1 has, but the strange thing is that Windows still cannot play the movie back even if it is in "Motion JPEG" format and bundled software or the QuickTime player must be installed. So, I must give a credit to Pentax for the excellent software compatibility of the K-x and its Motion JPEG provision as well. I do like Pentax can give a compressed format option, though, say, MPEG4 which is compatible to the Windows Media Player by default.

Well, on the other hand, if you use Apple/Macintosh system, the case is just opposite. QuickTime MOV is the format it can playback by default, anyway. (But I still believe that Windows is still the mainstream for most users.)

Nevertheless, I just often wonder about the longevity of those movies which are encoded and recorded in different format nowadays. Years or decades later could us still be able to install the Codecs nowadays to play them back? So, using the most primitive format in open standards would not be a bad idea.

Next, let me talk something about other additional options and features of the movie recording of the 550D. Firstly, it has many manual options for choosing the WB, ISO, Tv and Av. Secondly, the user can still take picture during movie recording (using the shutter release button, still). Thirdly, CDAF can still be engaged if required and there is an option for doing so (although focusing noise and hunting will be be recorded):



As you can see from the above, I enabled the CDAF option and changed it from the factory default of being disabled. How can I take a sharp still picture if I could not re-focusing?

Furthermore, I add grid lines in the option (fewer lines one) so as to help composition and levelling during movie recording:



Battery Life:

The power source is reliable and durable. I have not much to worry about, in contrast to what I have to do with my K-x from time to time! :-(

"Auto Lighting Optimizer" and "Highlight Tone Priority":

I turned off these options as I think they create more problems than what they worth. Proper metering and exposure control should be the way to go and for better DR, we have to tune down the contrast and make a less steep tone curve than what Canon gave us by default!



"Peripheral Illumination Correction":

Actually, almost every EF lens can be corrected in-camera but you have to select and activate particular lenses of yours via the latest EOS utility (which supports the 550D) before you can select and enable the function via the camera's menu:





The Screen Colour:

I choose Colour Scheme 4 as it won't hurt my eyes when I operate and view the screen at darker ambient light conditions. The default scheme may look a bit smarter for the graphics and may yet be slightly easier to read very bright outdoor under the sun but under which the LCD is difficult to read anyway. Furthermore, I suspect some battery power could be saved by displaying a dark background image than a white one for the operation interface (which are on for most of the time during operation) if the LCD driver is designed to control the back-light power dynamically:



World Time:

The 550D does not support World Time / Dual Time. So, when you travel, you have to change the time manually (which is somehow inconvenient then):



Mirror Lock Option:

The 550D has a mirror lockup option that can be activated via one of the Custom Functions, not bad for an entry level DSLR:




2. My Best "Optimal" Settings (Default for General Shooting Purposes)

With all backgrounds I have brief above, here is a quick summary of the settings used for/in "my" camera:-




3. Samples

Copyright Notice: All images and movie clips are copyright by me and no unauthorized use of any is allowed prior to my written agreement.

I) Still Pictures

All pictures were produced using the 550D and the kit lens 18-55 IS solely (although I have another six Canon EF lenses myself, 3 L zooms and 3 primes), with the single universal set of settings I have briefed in the above (some with certain exposure compensation as appropriate).

The pictures are all resized to 3,999 pixels in width, all EXIF data are preserved. (Warning: Large Files)

http://smg.photobucket.com/albums/v313/RiceHigh/550D/Full_Samples/?start=all

Remarks: Full size un-retouched samples are also available for download in the above, just select image and download them one by one if desired, using the Photobucket option (under "download" and then select "high res image").

Happy measurbating! You can always verify if what I have told in my this review are true or not, by yourself! :-)

II) Movie Clips (via YouTube)

All movies were recorded using fully automatic settings by default, no manual override of any was applied.


(URL: http://www.youtube.com/watch?v=NHZMGVRuZPY)


(URL: http://www.youtube.com/watch?v=iqbGVQhBkpg)


(URL: http://www.youtube.com/watch?v=mRvFxvYe9pc)


Acknowledgement: My special thanks to my friend "Laden" who kindly lent me his new 550D unit for use and testing for a month. Thank You! :=)


Read Also:-

Summary Matrix for Equipment Tests and Reviews

550D + 17-40L/4 Vs K-x + 16-45/4 & ISO Shootout

My K-x Full Review

My K-m Full Review

Wednesday, June 30, 2010

Yet Another SDM Victim (and the SDM Petition Reminder)

See this latest user report and SDM is actually the culprit for the problem(s) which the user is complaining about:-

http://www.pentaxforums.com/forums/pentax-dslr-discussion/105420-remind-me-why-i-should-stay-pentax.html

As a reminder, for those Pentaxians who suffered and is suffering from the SDM failure and issue(s), please sign this online petition, you can contribute a little bit more to push Pentax/Hoya to admit the problem (wishful thinking anyway, I knew) so that the inherent/latent bug can be removed (not until that there will be brighter future for the brand Pentax!). For more details and the background, see:-

http://ricehigh.blogspot.com/2010/01/sdm-petition-online.html

Well, I haven't signed yet so far. But if the number of signatures approaches 1,000, I will sign.

Besides, Pentax/Hoya should give us a True Ultrasonic AF driving solution for real system performance (as we all knew SDM just means Slooow and Sluuugish), shan't they?

Tuesday, June 29, 2010

Like the iPad Idea but Will Wait for the Eee Pad

Recently played the Apple iPad for times at a shop but haven't been able to get decided to buy it. It is not only because of the (only overseas) shop I went to did not sell the iPad cheap enough when the local tax was included (and there is no tax redemption at that country, i.e., Canada), but more because of the real annoyances of the iPad that I can't live with. Anyway, now I have been triggered to get a Pad ;-) It is just because the Pad does have its unique usage for my applications. Maybe the Asus Eee Pad this time, but then I have to wait, since it is told officially by Asus that the Eee Pads are only to be available by early 2011! :-(

Below are what I like and dislike about the iPad anyway:

iPad Likes:

- Easy to carry (compact in size and lightweight), stylish appearance;
- Beautiful display: colourful, sharp, wide angle-of-view;
- All basic applications on-the-go: Internet, Multi-Media and also Games;
- Useful multi-touch screen, unique user interface, very responsive control;
- Very fast browser and photo viewer;
- Not really too expensive for the basic package (16GB and Wi-Fi Only)

iPad Dislikes:

- Glossy screen that reflects too much light, an annoyance outdoor (ditto for the Asus Eee Pad anyway);
- No USB port, no built-in card reader!;
- No flash support for browser;
- Uploading and downloading files from and to the iPad are just too difficult and there are just too many restrictions;
- No standalone pdf support! How can I read the e-documents then? I just won't bother to convert every pdf into Apple's format anyway. One can view pdfs as email attachment in the iPad, though. But why? This is just a real annoyance! :-(
- No official "shelf" to support the "mon". There is an offical keypad, though.
- Hong Kong (and maybe Taiwan as well) is/are not a market where Apple treats us seriously. There has been no official iPad on sales in HK yet nor the iPad supports Traditional Chinese characters and input well enough. If one has to buy an iPad in HK, the only choice is the grey market goods.

On the other hand, the Asus Eee Pad uses Windows 7 (or variant) and has all the ports (USB, HDMI, SD card reader, etc.). The 12" Eee Pad is just a fraction lighter than the iPad, which is just amazing. But of course, it is larger in size.

The Eee Pad has an interesting keyboard and dock as an optional accessory, which when the Eee Pad is docked, the combo becomes indifferent from a Laptop! Brilliant design and an innovative idea indeed! (Thumb Up!) Moreover, the Eee Pad's targeted marketing price is just cheaper, and it is much cheaper than the most expensive version of the iPad, i.e., 64GB with 3G support.

Once again, when the Pad story applies to cameras and industry, it just tells us that new market opportunities are always there, provided one knows how to explore and market. Innovations and brilliant ideas are always the keys to success!


Read Also:-

Pentax' Performance Evaluation Against Forbes' Seven Secrets of (Successful) Companies

My Idea of a K1000D

One More 645D Full Size Sample (Portraiture)

Further to the images posted at Travel67 by Chris Wilson, there is a full-size portraiture sample posted by Peter Fang at his flickr page, via his DPR forum post:-

http://farm5.static.flickr.com/4096/4734574113_fbb644454f_o.jpg
(Warning: Very Large File in 17MB)

The image is RAW converted using the Lightroom. As before, I just don't like the skin tone rendition and its colour response, as I have seen from other samples as well. Frankly speaking, I found that the 645D has the old colour response and taste of the old *ist D, which of course is not so favourable for my own taste, at least.

Btw, as already have been pointed out by Peter, the lighting condition was not so favourable anyway. I guess he would post more samples which are to be taken under better conditions. Hopefully I can see some images that are produced directly out of the 645D which is all by Pentax as a package then. Stay tuned, I blog, you decide~


Read Also:-

The 645D Kit (Lens) Got Delivered to an End-User

Full Size 645D Samples from DC Watch

Monday, June 28, 2010

Vanishing of Traditional Printed Photo Media?

Recently, I picked up several "prestigious" and "renowned" traditional printed Photo magazines when I travelled overseas at different bookstores for several times but I yet didn't find any of them worth buying after scanning through them for just one minute or two.

I actually found that the contents of those are outdated and almost and mostly useless. And Ads could constitute almost half of the pages actually. In fact, for gear related stuff, many of the published information are trivial and well known. In particular, for a particular "Popular" magazine, the camera tests done and published are now rather crude which those "tests" are actually by no means could even match the quality and higher standard for the tests they published decades ago, which is undoubtedly a big disappointment. For photography related topics, some magazines do have more on these and some others have almost none, on the other hand. But I still found that there are little things that are really special anyway. So, why spend/waste a few bucks in buying those afterall?

In fact, nowadays almost everything can be found on the Internet, which are quick to locate and could be far more useful, provided that you locate the right and useful things. The contents are rich and most of them are free basically (even though you have paid indirectly). Even I do find now the newly emerged online photo magazines are edited and produced in higher standards, with more useful and interesting stuff. For example, I do like the PhotographyBB Online Photo Magazine, which I consider to be quite well made so far, and it is highly recommended.

Without true revolution, I just wonder how long will take for those traditional printed media to vanish? My bet is that they cannot survive for more than one decade to come, if the trend continues, frankly.

On the other hand, I do still buy some printed local magazines from time to time, but those are actually new-style ones and I could see the editors do have put a lot of efforts and done some hard works from time to time in finding materials, doing tests, writing photo/software tips and articles and in editing, which are quite different from those old "prestigious" magazines, which seem to be just sitting there and wait to die! :-o :=x

Friday, June 25, 2010

645D and Eye-Fi Card (YouTube Demo)



(URL: http://www.youtube.com/watch?v=wY6GdxDyP1w)

Where you can see the Eye-Fi demo (in Japanese) and also hear the shutter sound of the 645D (which is not bad IMO, the time lag seems to be good enough, especially for a Medium Format SLR, which has a large mirror).

Wednesday, June 23, 2010

DxOMark Lenses on Bodies Measurbation Paradise! :-o

Here you can go and enter another paradise of measurbators! (but actually might be a new hell for true photographers! ;-D) A step-by-step guide below!

1. Go to:-
http://www.dxomark.com/index.php/en/Lens-with-Camera/All-tested-lenses

First of all, you can select the "Filtered View" if you like. I think this can be useful when the test database continues to grow;

2. Choose the Lens Model and then the Camera Body, then you can see the "Overview" of a summary (on scores);

3. Go to the Individual Tab to view different page/test results of "Resolution", "Transmission", "Distortion", "Vignetting" or the "CA";

4. There are Sub-Tabs to see/access to all the test data at different Focals (for zooms) and different Apertures. Just choose it, appropriate charts and graphs will be shown. There are also "Field Map" representations, which are simply a plot of the image frame with different colours to represent the results and different performance aspects measured.

With doing the above four steps, dig into different sub-tabs and choose different focal/aperture combinations and then compare different lens/body and so on, you will be a true qualified measurbator! Congrats! But before you are to do this endlessly, do remember time will always be not enough and is killed very quickly as such!

Two quick observations, btw:-

1. High resolution bodies do have a clear edge for obtaining higher scores, especially for the aggregrated mark of "Lens Peak Score".

2. Full Frame cameras perform better, even for the same pixel count and equivalent effective 135 focal length and FoV.

Besides, some more quick reading notes and remarks:-

1. "TStop" is just the actual f-stop measured for the lens (wide opened) at specific focal length, the EV stop differences against the specified ones at different focal lengths are represented at second plot chart below.

2. The MTF charts should be read as they always should, it is just a plot of the Modulated Transfer Function (the difference between the levels of Black and White) against the (different) Spatial Frequencies. Normally, MTF 50% is the default threshold for measuring Resolution, but of course a different MTF value can always be chosen, no matter it is higher or lower. Of course, should the set MTF threshold is set to be higher, the Resolution results drop and vice versa.

3. The measured "Resolution" of lp/mm (line pairs per millimeter) is NOT normalised for the sensor size and format but just a physical measure on the actual resolution regardless of the sensor size. On the other hand, another commonly used (but newer) resolution measurement unit LW/PH (Line Widths per Picture Height) is normalised. So, this should be something that you should be aware of. Just say with exactly the same resolution figure for both an APS-C combo and a Full Frame combo, indeed the FF just outperforms the APS-C as the resolution of the APS-C is needed to be "magnified" just for the same printout and viewing size of the "same" picture.


Read Also:-

Useful Lens Review Links

A New Measurebators' Paradise!

Dictatorship/Censorship Alert (Reminder)

As you may have known, the PentaxForums.com has been blocking my every link as quoted by any of their "members" for long. But I'm still somehow surprised on their insistence on doing that and the indeed good consistence by different "moderators" as well. They just even don't allow just my name is mentioned, in addition to no link is allowed to be posted already (then the innocent *ordinary* members are prosecuted), even though they haven't banned my membership at their place, so as to show some kind of pseudo open-minded-ness, a latest example:-

http://www.pentaxforums.com/forums/pentax-news-rumors/105390-da*-55mm-1-4-lens-hood-discontinued.html

Quoted, "Edit Reason: Link to blog of "he who's name shall not be mentioned" "??!

In fact, this is totally peremptory and imperious and that they are actually rather disrespective to their ordinary forum members. Yes, they have the right to do anything at their own place and premise, even they do evils, but I do believe this is just totally not justified and unjustice.

Edit: I think Adam, site owner of the PentaxForums(.com), should add in his forum rules that: 1. No content and not any content of the RiceHigh's Blog shall be linked (to); 2. No name of RiceHigh shall be mentioned! But since that they do not and could not mention me, how can they set up such two rules? ;-) Otherwise, I think they would have done that already! But anyway, the rules are there, even they are hidden, over that "No RiceHigh's PentaxForums"! ;-D Lol..


Read Also:-

PentaxForums.com is Building a New "CanikonForums"!?

Don't Join Any Forum that Has Censorship and Heavy Filtering

Hypocrites/Cowards of those "Pentax" Forums

Tuesday, June 22, 2010

Pentax' Performance Evaluation Against Forbes' Seven Secrets of (Successful) Companies

First, I have read how Nikonian guru Thom Hogan evaluates Nikon against the seven aspects and criteria as highlighted by the Forbes (via the 1001 Noisy camera). And I think such an evaluation of Pentax would also be very interesting. So, here we go:-

1. Design: Moderate

As we all know, Pentax has been lagging behind in core technologies and system performance, as well as the selection of bodies and lenses. But it gives Pentax a few more marks with the aesthetic design and selection options of the coloured K-xes as well as the recent new models of P&S DCs, which have more unique styles and opened up new fashion trends. So, I've still given a "Moderate" rating here.

2. Speed: Poor

The product launch of Pentax has never been updated and new products are announced and coming out so slow and too late.

3. Cost: Good

Pentax' factories are now at the Philippines and Vietnam ONLY, for the manufacturing of digital bodies and lenses respectively. So they could really keep all the manufacturing costs really low enough to very low. But then do note that this has nothing to do with whether they would sell lenses at lower prices (but actually just much higher now) and if the manufacturing standards and quality of the products could be kept (the reverse is true, IMHO)!

4. Service: Moderate

I do have experienced improvements of service (but still not good enough) since Pentax raised crazily the prices of their lenses and since they have migrated all their lens production completely to the Vietnam factory! (More profit margin then better services? >:-o)

5. Communication Outside: Poor

Needless to say, Pentax virtually has no marketing at all and their communication to the stakeholders for their success is rather poor. Actually, it seems that they just don't know who are the stakeholders at the end of the days. So it is just helpless.

6. Communication Inside: Good (I guess)

After being cut a lot of fat and laying off of many staff / closing down of Japanese home production facilities, I guess the communication within such a smaller size division (within a big company) should now be more effective and good enough than before!

7. Purpose: Poor

The purpose of Hoya in doing the Pentax camera business is actually unclear. Someone says that they want to make the financial facts good so that they can sell it out to someone else (in fact, there are some previous news reports about that). People said before that Hoya only interested in Pentax' medical business but not the same in the camera business. And the fact is that Hoya has been much cost conscious in running the Pentax business since they acquired them. In fact, I have never seen clear commitment from Hoya in Pentax. A good example is that there has been no update in the Pentax lens development roadmap for years now. The dead air has actually been here for so long and new product launch and announcement is nearly non-existent (and not even just slow, if I have to say).

So, my analyses end here. It is just not so optimistic after all. :-(