K-5 Purple Fringing real or imaginary?

mcs · 03-20-2011, 05:02 PM

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

Adam · 03-20-2011, 05:22 PM

Originally posted by mcs

much ado about nothing

More likely than not, that's the case.

JohnBee · 03-20-2011, 06:12 PM

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.

Wheatfield · 03-20-2011, 06:52 PM

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.

Rupert · 03-20-2011, 07:20 PM

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.
Regards

deadwolfbones · 03-20-2011, 08:38 PM

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).

deadwolfbones · 03-20-2011, 08:38 PM

Also noticed it more on the K-r I tested than on the K-7/K20D.

Smeggypants · 03-20-2011, 08:46 PM

Can't say i've noticed PF more on my K-5 than I have on my K20D/K10D

dlacouture · 03-20-2011, 09:35 PM

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...

m8o · 03-20-2011, 09:57 PM

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.

lockheed · 03-21-2011, 01:29 PM

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.

Class A · 03-21-2011, 04:55 PM

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".

DogLover · 03-21-2011, 05:01 PM

Originally posted by Class A

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.

Winder · 03-21-2011, 05:45 PM

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.

normhead · 03-21-2011, 06:19 PM

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.

03-20-2011, 05:02 PM	#1
mcs New Member Join Date: Mar 2011 Location: Maryliand Posts: 7	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
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by mcs much ado about nothing More likely than not, that's the case. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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03-20-2011, 06:12 PM	#3
JohnBee Veteran Member Join Date: Sep 2008 Location: Newrfoundland Photos: Albums Posts: 4,667	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
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,981	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
Rupert Veteran Member Join Date: Sep 2006 Location: Texas Photos: Gallery \| Albums Posts: 25,123	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. Regards

03-20-2011, 08:38 PM	#6
deadwolfbones Veteran Member Join Date: Sep 2007 Location: La Crescenta, CA Posts: 7,450	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, 08:46 PM	#8
Smeggypants Veteran Member Join Date: Sep 2010 Posts: 1,536	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
dlacouture Veteran Member Join Date: Jul 2008 Location: Var, South of France Photos: Albums Posts: 1,074	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
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092	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
lockheed Inactive Account Join Date: Jun 2008 Location: Finland Photos: Albums Posts: 20	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
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	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
DogLover Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 2,054	Originally posted by Class A 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
Winder Veteran Member Join Date: Apr 2010 Location: Tennessee Posts: 6,617	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
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	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.