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Old 2nd of June 2010 (Wed)   #1
Poe
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Default Canon 85mm f/1.8 Purple Fringing

Does anyone else find that this lens has much more purple fringing than expected even at f/2.8 or f/4?

I expected this behavior wide open and even at f/2, but it doesn't seem to be controlled at all, even at f/4.

Could the fringing be augmented by some elements out of alignment and something that Canon repair could fix? I really want to have it significantly reduced at f/2.8 and smaller without having to resort to desaturation of the purple channel which is a global image alteration in post-processing.
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Old 2nd of June 2010 (Wed)   #2
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Default Re: Canon 85mm f/1.8 Purple Fringing

Post an example. CA should be very low with this lens.
http://www.photozone.de/canon_eos_ff..._18_5d?start=1
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Old 2nd of June 2010 (Wed)   #3
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Default Re: Canon 85mm f/1.8 Purple Fringing

I expected to see lots of fringing when I bought this lens based on reports, but I can't even find any on backlit subjects at f1.8 until I zoom to 100% view. So no, I don't have this problem .
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Old 2nd of June 2010 (Wed)   #4
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Default Re: Canon 85mm f/1.8 Purple Fringing

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Originally Posted by gjl711 View Post
Post an example. CA should be very low with this lens.
http://www.photozone.de/canon_eos_ff..._18_5d?start=1
I should be able to post some examples when I take my lunch break.

Their test shot/comparison tool show very little LoCA. From what I have seen, mine shows a lot more.
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Old 2nd of June 2010 (Wed)   #5
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Default Re: Canon 85mm f/1.8 Purple Fringing

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Originally Posted by Poe View Post
Does anyone else find that this lens has much more purple fringing than expected even at f/2.8 or f/4?

I expected this behavior wide open and even at f/2, but it doesn't seem to be controlled at all, even at f/4.

Could the fringing be augmented by some elements out of alignment and something that Canon repair could fix? I really want to have it significantly reduced at f/2.8 and smaller without having to resort to desaturation of the purple channel which is a global image alteration in post-processing.
On some shots , it's been really bad at 1.8-2.0. But it really depends on what I was shooting. But i haven't really noticed it at 2.8 or f/4.
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Old 2nd of June 2010 (Wed)   #6
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Default Re: Canon 85mm f/1.8 Purple Fringing

I've had this lens for several years, but I'm usually only using it with studio lighting. In situations without controlled lighting, I have often noticed purple fringing at f/2.8 and wider, but only in very high contrast transition areas of a photo. Fix in PP and move on. I can't recall that I have noticed this in shots at apertures smaller than f/2.8.
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Old 2nd of June 2010 (Wed)   #7
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Default Re: Canon 85mm f/1.8 Purple Fringing

Like others have said I notice CA a lot at 1.8 and 2.0. It is much better at 2.8 to 4.0 but still shows up in high contrast shots.
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Old 2nd of June 2010 (Wed)   #8
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Default Re: Canon 85mm f/1.8 Purple Fringing

Go in Lightroom, and decrease purple saturation....should work well unless your subject is rocking purple.
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Old 2nd of June 2010 (Wed)   #9
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Default Re: Canon 85mm f/1.8 Purple Fringing

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Originally Posted by Cheever View Post
Go in Lightroom, and decrease purple saturation....should work well unless your subject is rocking purple.
This changes the white balance of the entire image among other things.
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Old 2nd of June 2010 (Wed)   #10
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Default Re: Canon 85mm f/1.8 Purple Fringing

Mine was awful, especially on specular highlights and high contrast areas.
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Old 2nd of June 2010 (Wed)   #11
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Default Re: Canon 85mm f/1.8 Purple Fringing

Since I don't shoot chrome or barcodes or water with it, the PF rarely rears it's ugly head.
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Old 2nd of June 2010 (Wed)   #12
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Default Re: Canon 85mm f/1.8 Purple Fringing

On very high-contrast edges, PF is normal with the 85/1.8. PF isn't measured in CA measurements, just blue/yellow lateral CA.

Not overexposing helps a lot. If you think it's still too much, try getting it checked out or try another one.

Quote:
Originally Posted by Poe View Post
This changes the white balance of the entire image among other things.
If it does, then apply it to the edges, not the entire image.
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Old 2nd of June 2010 (Wed)   #13
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Default Re: Canon 85mm f/1.8 Purple Fringing

:Not overexposing eliminates it, except for barcodes
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Old 2nd of June 2010 (Wed)   #14
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Default Re: Canon 85mm f/1.8 Purple Fringing

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Originally Posted by bohdank View Post
Since I don't shoot chrome or barcodes or water with it, the PF rarely rears it's ugly head.
Mine was really bad shooting bare trees in winter. Seems like every branch had it.
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Old 2nd of June 2010 (Wed)   #15
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Default Re: Canon 85mm f/1.8 Purple Fringing

I have had this lens a few times and even at f2.8 the fringing was often an issue.
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