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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 23 Aug 2011 (Tuesday) 15:31
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Fixing fringing on the 85mm 1.8

 
paulkaye
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Aug 23, 2011 15:31 |  #1

Hi - I have an 85mm 1.8 which is a great lens in many ways - except for one thing; purple/green fringing on out-of-focus highlights (LoCA/bokeh fringing). I use both Bibble and Photoshop/ACR and have yet to find a satisfactory way of getting rid of it. Does anyone have any tips/tricks?


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Hardcore
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Aug 23, 2011 15:35 |  #2

Maybe the CA isn't as bad on the Sigma 85mm but I usually go manual corrections, then go down to CA and put "defringe" to All edges or highlight edges and play with the sliders to reduce the CA. Works well enough for me. For sure there would be better ways in photoshop but I haven't bothered with it.


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bpark42
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Aug 23, 2011 15:53 |  #3

paulkaye wrote in post #12986330 (external link)
Hi - I have an 85mm 1.8 which is a great lens in many ways - except for one thing; purple/green fringing on out-of-focus highlights (LoCA/bokeh fringing). I use both Bibble and Photoshop/ACR and have yet to find a satisfactory way of getting rid of it. Does anyone have any tips/tricks?

LoCA's can be very difficult to handle. The defringe setting might help a little, but the sliders are unlikely to be much use. If the issue is really bothersome you can try desaturation. Either globally desaturate if your image allows for it, or you can get down and dirty with layers/masking in Photoshop.

Hardcore wrote in post #12986363 (external link)
Maybe the CA isn't as bad on the Sigma 85mm but I usually go manual corrections, then go down to CA and put "defringe" to All edges or highlight edges and play with the sliders to reduce the CA. Works well enough for me. For sure there would be better ways in photoshop but I haven't bothered with it.

The Sigma is pretty bad in the LoCA department (like most ultra-fast lenses). If you shoot wide open or close to it with high contrast items in the foreground and/or background the problem should be pretty obvious. You will see magenta fringing in front of the focal plane and green fringing behind it. The CA sliders won't do much since they are designed to handle lateral CA's.




  
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bohdank
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Aug 23, 2011 15:53 |  #4

Bokeh fringing. Not sure if there is an effective way to get rid of it.


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Aug 23, 2011 15:55 |  #5

Local desaturation is what I do when needed.


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bob_r
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Aug 23, 2011 16:40 |  #6

Here's a link to a method that should work for you:
http://www.great-landscape-photography.com/remove​-purple-fringing.html (external link)


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hieu1004
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Aug 23, 2011 17:22 |  #7

windpig wrote in post #12986482 (external link)
Local desaturation is what I do when needed.

This is pretty much what I do as well.


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bohdank
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Aug 23, 2011 17:46 |  #8

bob_r wrote in post #12986718 (external link)
Here's a link to a method that should work for you:
http://www.great-landscape-photography.com/remove​-purple-fringing.html (external link)

That explains purple fringing but not bokeh fringing.


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paulkaye
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Aug 24, 2011 16:27 |  #9

bohdank wrote in post #12986467 (external link)
Bokeh fringing. Not sure if there is an effective way to get rid of it.

windpig wrote in post #12986482 (external link)
Local desaturation is what I do when needed.

You've confirmed what I'm thinking - there's no easy way. Local desaturation works but it's fiddly, especially if there are a lot of highlights. I guess I just need to live with it.

Anyhow - thanks to all who responded. BTW - looked at most of your flickr/Smugmug links and I must say, I'm mighty impressed by the work on display. This forum must represent some of the most talented photographers on the planet.


Paul
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windpig
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Aug 24, 2011 17:04 |  #10

paulkaye wrote in post #12992953 (external link)
You've confirmed what I'm thinking - there's no easy way. Local desaturation works but it's fiddly, especially if there are a lot of highlights. I guess I just need to live with it.

Anyhow - thanks to all who responded. BTW - looked at most of your flickr/Smugmug links and I must say, I'm mighty impressed by the work on display. This forum must represent some of the most talented photographers on the planet.

Well, if it's any consolation, the 85LII is not immune.


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Fixing fringing on the 85mm 1.8
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