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03-20-2011, 05:02 PM   #1
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K-5 Purple Fringing real or imaginary?

I'm thinking of trading my K-7 for a K-5, but I'm concerned about purple fringing issues which came up on my internet search. Purple fringing on my K-10 is one of the reasons I upgraded to the K-7. From what I read the IQ and the ISO range of the K-5 would make this a no-brainer except for the PF concern. Is it real? was it limited to the first batch which had the sensor issues? or is it much ado about nothing? Thanks

03-20-2011, 05:22 PM   #2
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QuoteOriginally posted by mcs Quote
much ado about nothing
More likely than not, that's the case.

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03-20-2011, 06:12 PM   #3
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I've been shooting with the K-5 for over a week now and I haven't noticed anything out of the norm in this area(and I'm an admitted measurbator!). I haven't pushed all the stops with regards to lighting conditions, but so far, where highlights and edge distortion goes, everything looks about the same as it did with the K20D.
03-20-2011, 06:52 PM   #4
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Purple fringing is one of those things that you will find in any camera if you go looking for it.
OTOH, if you are ware of what conditions will cause it, it is pretty easily avoided.
I don't think the K5 is any worse than any other camera I have used or seen results from in this regard.

03-20-2011, 07:20 PM   #5
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Only had a few days with the K5, but I have shot in some "PF territory" without any notice of a problem. Some lenses are more prone to PF, but I haven't seen anything yet on my K5 that would hint at a problem. If you put on the right/wrong lens, like some of the 70-300 models, any camera will PF in the right circumstances.
03-20-2011, 08:38 PM   #6
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I definitely notice it more on my K-5 than I did on my K-7 and K20D, but it's not a huge deal (and generally easily fixable in post).
03-20-2011, 08:38 PM   #7
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Also noticed it more on the K-r I tested than on the K-7/K20D.
03-20-2011, 08:46 PM   #8
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Can't say i've noticed PF more on my K-5 than I have on my K20D/K10D

03-20-2011, 09:35 PM   #9
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Noticed it too...

I'm coming from k10/k20/k7/kx (but always with the same lenses set), and on some shots it's quite present...
It comes from the exceptional DR, it seems...
03-20-2011, 09:57 PM   #10
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I will say I thought I was seeing more CA & Fringing than on my K10D, well before I saw anyone make a thread about it on this forum here. So I think there's something to it. This is the 1st time I've said anything about it because I have my K10D but haven't done any comparisons, like I need to to be sure.
03-21-2011, 01:29 PM   #11
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I'm getting more PF with K-5 than with K200D, from the very first pictures I took with it (and I wasn't aware of this "problem" beforehand, so I was taken by surprise a bit). Don't know if this is because of higher pixel count, using higher iso values, or what.
03-21-2011, 04:55 PM   #12
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Unless proven wrong, I think one should chalk up the perceived increase of PF on the K-5 to the higher resolution. At 100% viewing, PF on the K-5 will look worse than on any other Pentax APS-C camera even if the PF is the same in absolute terms, just because of the added magnification. Maybe K-5 images also have higher micro-contrast which would let PF appear to seem worse.

PF is caused by lenses and if the K-5 indeed made it more visible than just because it is a better camera. Sensor blooming is a thing of the past and while I cannot exclude other sensor-related causes, again, I'd plead for "innocent unless proven guilty".
03-21-2011, 05:01 PM   #13
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QuoteOriginally posted by Class A Quote
PF is caused by lenses and if the K-5 indeed made it more visible than just because it is a better camera. Sensor blooming is a thing of the past and while I cannot exclude other sensor-related causes, again, I'd plead for "innocent unless proven guilty".

Solid logic.
03-21-2011, 05:45 PM   #14
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I agree with Class A. Lens is very important in judging PF and the higher you MP count the easier it will be to see.

Newer lenses with low dispersion glass or flourite minimize the issue. IF you are getting a lot of PF then try a newer lens design.
03-21-2011, 06:19 PM   #15
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I'm not a K5 owner, but.. the only purple fringing I've had was when I was testing the Sigma 120-400 that I returned. I was testing another couple lenses at the same time ie the 18-135, and Tamron 90 and couldn't reproduce the result. So my first question based on that experience would be, is this a lens issue? So, I'm in agreement with the above posts.

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