Friday, July 03, 2009

Strange Line in the Image of K-7 Appears Again!

View the original K-7 sample below:-

http://pentax.photoble.net/?L=en&exif=090702009

A strange brighter vertical line can be seen at the left side of the picture, which run from the top to the bottom, see the partial crop below:-



And, similar issue has been discovered by someone last time for a pre-production sample photo with the production firmware, which I reported before.

But the most worrisome thing this time is that the above picture was taken at just ISO 200, with a production K-7, although the exposure time is just a bit long, in 5 seconds.

I have not even stated yet about the noise that appears in the deep blue sky for such low ISO!

I think the IQ of the K-7 is just more than worrisome by now for what I have seen and inspected, especially for the noise issue, and now more so for one more specific issue and possibly hardware/software bug as well.

13 Comments:

Anonymous said...

Deep blue sky is normally prone to noise also on low ISO.

RiceHigh said...

How about pure Reds?

http://ricehigh.blogspot.com/2009/06/photographyblog-k-7-review-is-out-soft.html

Anonymous said...

Not so many comments here !!!
Maybe RiceHigh 's got a point...
I can't wait to read the final test of the final product in French magazines "Réponse Photo" & "Chasseur d'images" to see if they noticed such defects....
Maybe a firmware update will fix this... :-/

Leodileo.

Anonymous said...

Why comment when even if you find contrary evidence or facts relating to other cameras your simply dismissed as a fanboy.. I'll wait for some REAL meat before passing any judgments.
1 comment though, sensors (of all brands and kinds and may be more related to the whole assembly chain)are prone to variation on a larger level then most would care to admit (starting w/ the sensor manufacturers). Just the way it is.
OF COURSE you can only find the "real" information here... snicker snicker.........

Anonymous said...

this worries me, I have a Pentax K110 and got it shipped to Pentax because I was getting lines like this one in the picture. I was just going to buy the K-7 since my K110 is older and it's probably going to be more expesive to fix it than it's worth it. But will this problem occur on eveery camera or is it just a manufacturing problem?

RiceHigh said...

I don't know at this stage for what are the causes of the issue, but up to this moment for the few K-7 sample photos I have already inspected, the problem has appeared twice already, for different K-7 units at different countries (including the full production unit at the Japanese home), which is just not a good sign for the "safety" and bug-proofness of the K-7! :-(

Anonymous said...

Ricehigh said;
How about pure reds?
He was referring to this:
http://pentaxdslrs.blogspot.com/2009/06/pentax-k-7-firmware-10-test-at-iso-100.html

Yvon Bourque replied:
For those that have commented on this blogsite and other blogsites, that the high ISO shots were too noisy, consider this: The whole picture above was taken at ISO 1600 and the cropped image fits 36 times in the original picture. On my screen, the cropped image represents 7" on the horizontal screen and as you can see, the cropped image fits 4 1/2 times in the horizontal side of the full image. Therefore, if this example was printed instead of on your monitor screen, it would measure approximately 31" on the horizontal and 20" on the vertical. Would you look at a print that size six inches away? I don't think so. You would look at it hanging on a wall, at a distance of three feet away or more. Now back away from your screen about 3 to 4 feet and the noise becomes irrelevant. Of course, as always, this is my opinion. Also remember that the image has been resized to 600 pixel wide because the camera is still a pre-production model and we are asked not to publish any photos higher than 640x480 until the production K-7 is out.

Anonymous said...

RH seems you always leave out the small details...

RiceHigh said...

Yvon Bourque's crops are 100% ones and we see obvious noise.

There is no need to quantify and elaborate further for what is a 100% view for a digital picture and every person who view in full size knows! And, its resolution is not very high by today's standard, it's only in 14.6MPs!

In fact, viewing a Canon 5DII picture in 21MP+ in full size will reveal much less noise at ISO 800 than the K-7 picture in ISO 200, even both are viewed in 100%! (which is already unfair to the 5DII!)

Anonymous said...

just for fun, when you get your k7 why don't YOU go and take some equal photos of w/ the 5d and k7 and post them. For all your babbling you never once did an EQUAL side by side w/ Canon or Pentax...Now that some of your lenses can go on both you at least eliminated 1 variable.. C'mon go for it!

Anonymous said...

"In fact, viewing a Canon 5DII picture in 21MP+ in full size will reveal much less noise at ISO 800 than the K-7 picture in ISO 200, even both are viewed in 100%! (which is already unfair to the 5DII!)"

What??? It's unfair for the K-7 not the 5D2!! The 5D2 has a pixel density of 2.4MP/cm² vs 4MP/cm² for the K-7. So yes you *should* see more noise at the pixel level on the K-7, this is normal.
I'm starting to think you're a chill for other manufacturers when you're blowing minor problems like this out of proportion. Now call me a fanboy because this is apparently the level of discussion that you prefer...

RiceHigh said...

So, where is a Pentax camera with lower pixel density? The *ist D/DS/K100D?

IQ/PQ is one of the two most important things for a digital SLR. If you don't have it, you lose 50% already. Speed is the remaining 50%, but Pentax lose again even with the K-7. So, Pentax lose ALL actually!

Anonymous said...

That the K-7 would lose against the 5D mk.II is rather normal, they're not using the same sensor size. You may want to compare the 5D to a PhaseOne back?

The lower pixel density is only for pixel peepers, at print level this has no real impact. http://www.dxomark.com/index.php/eng/Insights/More-pixels-offsets-noise!

And the K-7/K20D 14.6MP is IMHO better than the old 6MP sensors.

And your 50-50 on speed and IQ is not true, a lot people don't give the same weight to these 2 parameters. IQ is very similar amongst sensors of the same class and speed is irrelevant for composition.

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