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Monday, January 25, 2010

Low Effectiveness of SR of K-7 and K-x

Once again, tests continue to reveal the same, they all agree with each other!

http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=34339020

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Comments (8)

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Can't wait for the test result comes online.

Have you ever measurebate it yourself? if yes, how's ur test experience compared to their test.

I am leaning to body based stabilization because it works with prime lenses and the 24-70mm
No no no!

Mr Mabo (who knows almost everything about all cameras -just ask him!) has declared that there are tests showing Pentax SR is better than in-lens. These tests are either faked, flawed, or financed by another manufacturer.

And, for the record (in case you missed the 2,000-odd posts of Roland's - his 17-70 has not had an AF failure! Only a handful of early 16-50's had SDM problems, too.
When one uses a 3rd party lens to measure the IS-systems effectiveness, there is always a problem if the lens sends the correct focal lenght (at different zoom positions) to the camera as it is needed to effective IS. I once accidently had very different focal lenght set to the camera and the results were... well..."interesting".

Also test procedures are often flawed or limited - like using one target distance (different systems have different effectiveness for different target distances - all are bad or very bad at macro distances). I am not saying there are that here as I didn't bother to read the stuff :)

One thing that easily ruins the test is an impatient tester - the biggest drawback with K20D SR is the time it takes to "settle". Taking a picture before the SR symbol lits on the VF is easy to do (at least I never pay attention to the symbol unless I really concentrate my focus to it).

Here is a hint on how to improve one's SR-records - open the other eye too jut before you take the image. I think that the shaking VF image does create problems for some people.
1 reply · active 792 weeks ago
Yes, I think you have made a valid point that some people just overlook to wait for the SR symbol to lit up. The response of Pentax SR is actually slower and Canon's IS could do the job much faster, from my experiences.
About the newer (post-K20D) Pentaxes - maybe there have been cost-cut measurements in the production maybe due to new ownnership of the company, that have lowered the quality of the SR.

This would also explain why K7 image quality is clearly lower than it's predecessors with basicly the same sensor. I always though that the slightly faster readout of K7 was the culprit, but maybe the company uses cheaper electronics instead.
1 reply · active 792 weeks ago
I don't think so. It's the problem of Samsung. Don't blame Pentax. If one have to, the wrong choice and decision of Pentax for selecting that crappy Samsung sensor in the K-7 is the only thing that should be blamed.
Well, Samsung GX20 has better image quality than Pentax K20D that has better image quality than K-7...

The sensor is not really that bad. It is excellent at ISO 100 and perfectly fine upto ISO 1600. At ISO 3200 Pentax does something stupid and evil by doing noise reduction on the raw-files. I do shoot quite a bit at high ISOs, even very high, like 25k or 50k, and the big problem there is banding, especially on the top and bottom of the image area.

I of course do agree, that Canon and Sony do have superior sensors at the moment. Even so, Samsung sensor does offer much higher IQ than Panasonic 4/3-sensors, though this is probably only because of the much larger size of the imager.
1 reply · active 792 weeks ago
"Samsung GX20 has better image quality than Pentax K20D" - no kidding. Have you seen that? I'm not talking about the single DXOMark test who supposedly show this but can be explained - as most likely, the GX20 used later hardware than the K20D (yes, the hardware is tweaked in time, and afaik the cameras were made in the same Pentax factory, in Philippines... I doubt Pentax would put better hardware for Samsung ;) ).
Yep, the K20D/K-7 are up-to-ISO1600 cameras. I expect at least a tweaked Samsung sensor, with lower noise in the K-7's successor; let's see how it turns out.

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