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07-09-2007, 05:56 AM   #1
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*Ist DS vs K10D actual sensitivity

Hi,
I'm considering a used K10D. I've asked the seller to send me raw files from K10D and he sent them along with DS raw files of the same scene. As I expected the K10D has more noise than DS, but the thing that stroke me most was that K10D images were significantly darker at the same exposure settings. I had to use +2/3 ev in raw developer to compensate.
Anybody else noticed this? Could this indicate problems with that K10D? Am I being paranoid

07-09-2007, 06:51 AM   #2
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Well, I'll double check, are all of shutter speed, aperture, and sensitivity the same? Are you comparing exactly the same scene? The K10D does have a slight preference for underexposing.
07-09-2007, 06:53 AM   #3
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QuoteOriginally posted by Matjazz Quote
Hi,
I'm considering a used K10D. I've asked the seller to send me raw files from K10D and he sent them along with DS raw files of the same scene. As I expected the K10D has more noise than DS, but the thing that stroke me most was that K10D images were significantly darker at the same exposure settings. I had to use +2/3 ev in raw developer to compensate.
Anybody else noticed this? Could this indicate problems with that K10D? Am I being paranoid
The ISO speed rating and the actual ISO speed rating are matching and accurate for all Pentax DSLRs I have used, these include the *ist D, DS, K100D and K10D. As you say, when I used an external meter, then I know the actual ISOs were accurate. At least Phil Askey found the same:

Pentax K10D Review: 14. Photographic tests: Digital Photography Review

Pentax K100D Review: 14. Photographic tests: Digital Photography Review

So, if you asked me if it indicates problems with your K10D or just the K10D, I am afraid that the answer is Yes. It is just an underexposure problem for your case described.
07-09-2007, 06:56 AM   #4
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QuoteOriginally posted by SupremeMoFo Quote
Well, I'll double check, are all of shutter speed, aperture, and sensitivity the same? Are you comparing exactly the same scene? The K10D does have a slight preference for underexposing.
Amazing and wonderful creative new term "preference for underexposing"! Next time we can say about for "preference for out-focusing" if someone reports such a problem or etc.! LOL..

07-09-2007, 07:01 AM   #5
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As we all know, better slightly underexposed than overexposed, and it looks far better.
07-09-2007, 01:29 PM   #6
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QuoteOriginally posted by SupremeMoFo Quote
As we all know, better slightly underexposed than overexposed, and it looks far better.
Is that right? I always thought that it was best to expose to the right (of the histogram), to minimize noise in the dark areas. Generally, I expose for the highlights.
07-09-2007, 01:36 PM   #7
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The settings and the scene were exactly the same, lit by natural light from windows. A simple cloud over the sun could make all the difference and that is the most likely scenario.
I just wanted to make sure and RiceHigh answered just what I was asking.
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