Originally posted by Brew1brew Barry, To my eyes, the k3 shot at 51200 is under exposed, therfore noise will be higher.
edit: yes, checking the exif data, the K3 shot was at 1/180, the K5II shot was at 1/125 both at f5.6
Originally posted by jsherman999 I think your own tests are probably closer to the truth, as they
track closer to what DXOMark found when they compared the new 24MP D7100 to the 16MP D7000.
I don't know what's going on with those original IR samples. I wonder what firmware they had.
Originally posted by Brew1brew also, the 6400 shot has different exposures, K3 is 1/20th and the K5II is 1/15th, so again the shot that is under exposed is going to show more noise.
Edit: same at iso 100, K3 3sec and k5 4sec
Originally posted by rawr So your conclusions in one sentence are (tell me if I'm wrong): the Imaging Resource image samples make the K-3 look noiser than it is, perhaps due to some issues with colour balance or in-camera settings.
Your samples certainly look cleaner than the IR ones.
Thanks to all of you. I had to go away for a few days (back now) and felt that I had to publish my updated conclusions rather than just leave the earlier misleading results. But I didn't have time to analyse the results before departing.
Yes - the K-3 is giving
slightly less exposure than the K-5IIs. (Why?) Perhaps this is enough to make the difference.
Earlier I had thought I would use the K-5IIs for (rare) very high ISO shots. Now I think I'll use the K-3 anyway. The noise is probably about the same, but in dim light conditions the other advantages of the K-3 will probably make it better. Shooting at very high ISOs probably means shooting in extreme conditions, where I might be choosing lenses for maximum aperture then cropping later, or needing the
slightly brighter viewfinder, or needing all the help I can get from AF, or using exposure bracketing, which appears to be much faster with the K-3.
I have no regrets about buying the K-3 even though I have the K-5IIs. It is simply a well re-thought camera which will be seen to be an significant leap forward.