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12-15-2013, 10:02 AM   #1
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CA Correction bug in B&W

It would seem that the K-5II (at least) applies the CA removal AFTER applying any Picture Control settings. In this case, this leads to B&W images... with purple and green fringing on high-contrast borders. -_-

I'll post images when I get to the PC.

12-15-2013, 11:30 AM   #2
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Really? I never noticed it with my cameras, though I don't own a K-5(II). Though, i never looked for it.. might be worth to do some testing.
12-15-2013, 11:46 AM   #3
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I have samples ready, just no means to upload them yet .

I'd have thought this post would have got much more attention. After all, it confirmes that Pentax is doomed, right?
12-15-2013, 12:46 PM   #4
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I just tried this and I can confirm it. This is very surprising. And a bit disappointing.

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--Anders.

12-15-2013, 01:52 PM   #5
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Here are the shots I promised: First, the full scene:



Then, the uncorrected crop:



Then, the corrected crop:

12-15-2013, 02:36 PM   #6
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Haha, whelllp, hope someone mails Pentax this thread
12-15-2013, 03:34 PM   #7
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That certainly looks like an oopsie!
12-16-2013, 12:01 AM   #8
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I'll email them, does anybody know the contact address?

12-16-2013, 01:22 PM   #9
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QuoteOriginally posted by Giklab Quote
Here are the shots I promised: First, the full scene:



Then, the uncorrected crop:



Then, the corrected crop:

To be honest, I was hoping for something a little more dramatic!!! I was thinking B&W with readily visible eerie green halos. Perhaps a lens with more pronounced CA?


Steve
12-16-2013, 01:51 PM   #10
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QuoteOriginally posted by stevebrot Quote
To be honest, I was hoping for something a little more dramatic!!! I was thinking B&W with readily visible eerie green halos. Perhaps a lens with more pronounced CA?
Well, er, this was with the 18-135 at 135. Although sadly I don't have the first shot anymore, that one showed much more "CA".
On the other hand, the fact remains that the error is there, no matter if you can see it or not.
12-16-2013, 02:15 PM   #11
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QuoteOriginally posted by Giklab Quote
Well, er, this was with the 18-135 at 135. Although sadly I don't have the first shot anymore, that one showed much more "CA".
On the other hand, the fact remains that the error is there, no matter if you can see it or not.
I can see how this may happen. It is a bug, for sure.


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12-17-2013, 01:24 AM   #12
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Is this fixed in the K-3? Can anyone test that out?

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--Anders.
12-17-2013, 08:41 AM   #13
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I'm waiting for a reply to that from a local forum dweller.
12-17-2013, 11:20 AM   #14
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Just tried a quick test. No sign of any colour whatsoever in the black and white image, whether CA correction is applied or not.

The CA does seem to be applied properly also as the CA adjusted B&W image is significantly sharper in the corners than the non corrected one. In the colour images one of course sees the colour separating but in the uncorrected B&W image this of course translates into decreased sharpness. The increased sharpness in the CA corrected B&W image suggests to me that the correction is indeed being applied and it is applied before the B&W conversion.

I shot with the 18-135 WR @135mm F2.8 at almost closest distance, which is I think about the worst conditions for CA.

This was just a five minute test so don't rely too much on it but the result is at least encouraging.
12-17-2013, 12:11 PM   #15
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K-3 I guess? That means that they are aware of the issue. Now we need to shout at them to get them to update the other cameras as well.
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