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07-10-2010, 07:02 AM   #1
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DA40mm and purple fringing

Hi,

I got the DA40 recently (amazing lens) and I noticed a fair amount of purple fringing in high contrast situations. I am not sure how the limited lenses perform with regards to purple fringing.

I am posting some pics to demonstrate.

I enclosed the full picture and the 100% crop. I just want to know if this is to be expected or not.

Name:  IMGP6475-1.jpg
Views: 779
Size:  98.4 KB

View Picture EXIF
Name:  IMGP6475.JPG
Views: 830
Size:  56.2 KB

Thanks for the input. If the exif isn't in tact....It was shot wide open (f2.8) and at iso 1600 shutter speed 1/500s.

Ooops sorry if this is in the wrong thread. Probably should be in the lens forum.


Last edited by trevorgrout; 07-10-2010 at 07:05 AM. Reason: wrong forum??
07-10-2010, 07:47 AM   #2
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Most lenses behave like this in overexposed areas. Try it again with proper exposure around the tree, and it should be gone, as limited lenses tend to be quite good with CA.

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07-10-2010, 08:05 AM   #3
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I would expect to see pf in a high contrast area when shooting wide open.
07-10-2010, 08:12 AM   #4
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QuoteOriginally posted by MPrince Quote
I would expect to see pf in a high contrast area when shooting wide open.

He was shooting with the lens aperture wide open, even some "APO" exhibit this kind of fringing in under these circumstances.

07-10-2010, 09:55 AM   #5
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Welcome to the real world. Any lens can be made to fringe in certain situations.
07-10-2010, 10:39 AM   #6
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QuoteOriginally posted by Wheatfield Quote
Welcome to the real world. Any lens can be made to fringe in certain situations.
WORD!

Hmmm.... oddly enough, I haven't really noticed this with some of my cheaper ED coated DA's
If you spend enough time with a lens, you'll most likely find the recipe's that cause this and work to avoid it. Though the PF shown here is quite easy to fix too. The worst imo is color blooming and OOF CA(so to speak). Which are the nastiest bi-products in photography as fart as I'm concerned.
07-10-2010, 11:34 AM   #7
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I only take pictures of purple things, so fringing is not so much of a problem.
07-10-2010, 11:46 AM   #8
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QuoteOriginally posted by kerrowdown Quote
I only take pictures of purple things, so fringing is not so much of a problem.
HAHAHA! Good one...

07-10-2010, 03:14 PM   #9
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Since you have that lens mounted on a K-x, enabling the built-in lateral chromatic aberration correction might help reduce that fringing in your JPG's. (K-x manual, p-192).

I have this lens on a K-x and never see any purple fringing. Lens reviewers have also never remarked upon it as an issue - eg:
Pentax SMC-DA 40mm f/2.8 Limited - Review / Test Report - Analysis
and
Pentax Lens: Primes - Pentax 40mm f/2.8 Limited SMC P-DA (Tested) - SLRgear.com!

Having said that, shooting a high contrast item wide open into the light is always an invitation to CA. I also have to ask if you have placed a UV or similar filter on that lens? If yes, that is likely the problem.
07-10-2010, 03:46 PM   #10
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I'm sorry, I don't see purple fringing. I do see two poorly exposed images.
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