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K20D vs. K7 in High-ISO RAW Noise

Started Dec 5, 2011 | Discussions thread
GordonBGood Veteran Member • Posts: 6,314
Re: K20D vs. K7 in High-ISO RAW Noise

audiobomber wrote:

GordonBGood wrote:

This was confused somewhat when comparing images due to differences in compulsory raw data Noise Reduction (NR) with the NR for the K20D of the older more blotchy type (stronger) starting at ISO 1600 and the K-7 having the newer less blotchy type (weaker) compulsory NR starting at ISO 3200.

I've heard this statement before, but DXOMark shows both to have non-defeatable NR starting at ISO 3200 (signified by hollow dots on the SNR graph).

Dan, DxOMark are occasionally wrong in determining the exact point that NR starts using their autocorrelation tests. The Samsung GX 20 is essentially the same camera as the K20D in a slight different shaped body without Pentax's proprietary PEF format and DxOMark show it (correctly) to have Noise Reduction (NR) starting at ISO 1600. I have done my own autocorrelation tests on raw files from the K20D and confirmed that the compulsory raw NR starts at ISO 1600 for it as well.

Regards, GordonBGood

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