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11-04-2012, 01:02 PM   #1
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Sample images from imaging resource: K30 vs K5IIs

I know everyone has already had enough of this.
But I just came across the comparison between K-30 and K-5IIs, and can't believe what I saw....

The attached images were directly cropped from the samples downloaded from imaging resource.
(Imaging Resource "Comparometer" )

In theory, K-5IIs's images should be sharper than K-30's, right? But that's not what I can see from these samples.

Any ideas????


Last edited by kesong; 10-12-2014 at 08:59 PM.
11-04-2012, 01:14 PM   #2
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Because Imaging resources sucks at doing sharpness comparisons. You should only use them for noise comparison.

Possible reasons - RAW processing of files differ. Focus is slightly off.
11-04-2012, 01:33 PM   #3
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At F8 the gap should start to close, but with that said, the shots seem to be cropped very differently, which would suggest an unstable test setup.

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11-04-2012, 01:54 PM   #4
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Looks like the focus is off on the second one.

11-04-2012, 02:22 PM   #5
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Oddly enough, the 'resolution' shots for the K-30 and K-5 make the K-30 look better as well.
11-04-2012, 03:43 PM   #6
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Were these the "default" JPGs?

If so, then could it possibly just be difference in the in-camera sharpening?

Here's the K-5IIS crop taken from the post above and sharpened using FastStone Image Viewer:
11-04-2012, 04:18 PM   #7
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QuoteOriginally posted by JinDesu Quote
Because Imaging resources sucks at doing sharpness comparisons. You should only use them for noise comparison.
I see. Just thought comparing sharpness is one of the main purposes of doing such "strict" test

QuoteOriginally posted by Adam Quote
At F8 the gap should start to close, but with that said, the shots seem to be cropped very differently, which would suggest an unstable test setup.
Cropping was done by me actually. But in the original images, I see the same difference in sharpness.

QuoteOriginally posted by UnknownVT Quote
Were these the "default" JPGs?

If so, then could it possibly just be difference in the in-camera sharpening?
No idea. Only clue I can find is the file names, "K30hSLI00100NR0.JPG" and "K52ShSLI00100NRAD.JPG".
Does "NRAD" mean noise reduction advanced?
11-04-2012, 04:23 PM   #8
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The issue really is that they don't attempt to keep focus point the same. As Jin says, they are really only useful to see noise. Otherwise, it's a crap shoot.

11-04-2012, 04:33 PM   #9
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QuoteOriginally posted by kesong Quote
I see. Just thought comparing sharpness is one of the main purposes of doing such "strict" test
I used to think so, but after many review of their pictures, they kinda suck at making sure conditions are showing optimum sharpness/focus.

In fact, their comparometer is pretty crappy. For example, choose the 5D Mk3 files ISO 3200 and compare to the k-5. It should only be 1 stop of noise difference, but the 5D Mk3 files look fantastic. Until you check the file names and realize there's heavy noise reduction on the 5D Mk3 files.

They don't let you choose the files to compare in the comparometer.
11-04-2012, 05:17 PM   #10
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QuoteOriginally posted by kesong Quote
No idea. Only clue I can find is the file names, "K30hSLI00100NR0.JPG" and "K52ShSLI00100NRAD.JPG".
Does "NRAD" mean noise reduction advanced?
NR0 usually means NR=0
NRAD usually means default NR

So having NR=0 would in theory at least make the shot "sharper" as there is less degradation due to NR.

Should really use the same ISO and NR to compare.

But because it is ISO100 probably the NR does not have as much effect
as possible differences due to in-camera sharpening -

K-30 is regarded as an entry level dSLR - so obviously for "consumers"
whereas K-5IIs is regarded as at least semi-pro, and specialist due to the removal of the AA-filter -
so possibly may have less sharpening applied -

My sharpened version from your crop of the K-5IIs shows that it doesn't really give much away, if anything, to the K-30.
11-04-2012, 09:13 PM   #11
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It is a focus error/difference. Look at the velvet cloth under the area you cropped, and you can see how the K-5IIs has more detail than the K-30.
11-05-2012, 06:26 AM   #12
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Most likely there's more default sharpening in camera on the k-30 than the k-5 IIs, as stated in their k-30 review. This leads to more sharpening artifacts. If you process the DNGs of both cams at the same exact settings-preferably without any sharpening, you should find the IIs is sharper.
11-05-2012, 06:59 AM   #13
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First thing I'd mention is that you can never trust JPG's to evaluate sensor performance
The second thing I'd mention is that the K-30 is one amazing camera at nominal ISO. So good in fact, that is has no problems whatsoever keeping up with the K-5 IIs. And I think this is due in part to the weaker AA filter which can be observed by the moire pattern at the bottom of the proportional scale gradations which seem very similar between camera's.

Aside from that, when processed from RAW, both camera's are indistinguishable in terms of resolution and detail. Whereas the K-5 seems to slowly pull away as sensitivities increase. At which point the K-30 seems to give way to color noise degradation.

Hope this helps.

PS. I must say, that Pentax did a marvelous job with the K-30 which I'm hopeful is a preview of things to come in terms of the K-5 successor.

Last edited by JohnBee; 11-05-2012 at 08:53 AM.
11-05-2012, 11:56 AM   #14
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IR Comparometer photos are taken with manufacturers' defaults for NR, colour, contrast, sharpness, etc. Focus is random, I believe this is because they let the camera choose the AF point too.
11-05-2012, 12:07 PM   #15
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I'm still completely waffling k-30 or K-5 IIs. The difference is a good lens. ANd honestly, if you learn anything about the comparameter its that, there aren't many really bad cameras out there. If you printed the files you cropped those images from, and printed them at that size, the images would be almost 60 inches across. You have to ask yourself, how much difference would that make to my viewing pleasure? Almost none. The fact that you can see a difference on a 1:1 crop, doesn't mean you can see a difference anywhere else in the real world.
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