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07-07-2009, 09:18 PM   #1
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K-7 at ISO 1600

Without fanfare, here is a quick, non-scientific, K-7 grab shot at ISO 1600:

K-7; ISO 1600
DNG converted with ACR using DNG embedded profile

Here is the same shot converted to B&W:

K-7; ISO 1600
DNG converted with ACR; B&W conversion emulating Agfa APX 400 using Silver Efex Pro

Here's a link to view these images larger:

Intveld Images - Fine Art Photography

I suppose many will be disappointed that the K-7 doesn't produce a file like a Canon 5D Mk II or a Nikon D700. I doesn't even produce a file like a Canon 50D or a Nikon D90. It rather produces a file that, to my eye, is still distinctively Pentax.

I won't waste anyone's time making unreasonable comparisons .. if you want files that look like Canon's or Nikon's, it's fairly obvious which brand of camera will satisfy you.

I love the files from my K20D and I'm finding that the K-7 files are incrementally better. I'll be test driving this K-7 for a couple of weeks .. so far, it's a keeper.

07-07-2009, 09:49 PM   #2
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The noise looks mottled, I wish they could go for a more grainy noise on the photo.
07-07-2009, 11:11 PM   #3
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Digital noise is unlike film grain

QuoteOriginally posted by jct us101 Quote
The noise looks mottled, I wish they could go for a more grainy noise on the photo.
I'm not sure what you mean when you say mottled. I would say that digital noise in general tends to have a fairly uniform "pattern" to it and what I like about the digital noise present in the K-7 files is that the noise is quite random. To my eye this does more closely emulate film grain. You'll also notice that there is far less RGB speckling than in previous raw files from Pentax.

Bear in mind that much of what you see for digital noise is very dependent on your raw converter. Here's the same DNG file converted with Phase One's Capture One v.4.8:

K-7; ISO 1600
DNG processed with Capture One; DNG generic profile

This conversion seems to smear more of the detail but I think this shows less of the mottling you mentioned.
07-07-2009, 11:15 PM   #4
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Very acceptable noise here.
There's probably added JPEG artifacts as a confounding factor.

07-07-2009, 11:22 PM   #5
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The dark parts of the picture are very clean and the subject's fur has lots of detail.
07-08-2009, 01:03 AM   #6
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wow that is a good iso 1600 shot. I didn't see any noise in the first post. Then when enlarged, I still didn't see it until I moved closer to the screen and looked at the background.
07-08-2009, 01:06 AM   #7
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You can see the iso 1600 noise in the background, which is very acceptably film like.

The subject is nicely lit with good tonality.

Well done, I say.


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