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Canon 85mm f/1.8 Purple Fringing

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Thread started 02 Jun 2010 (Wednesday) 11:13   
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Poe
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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.

Post #1, Jun 02, 2010 11:13:11


7D (RIP?) | Σ 17-50 2.8 OS | Σ 30 1.4 | 50 1.4 | TAMRON 60 2.0 | 85 1.8 | 70-200 2.8L IS II | 580EX | MT-24EX |

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gjl711
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Post an example. CA should be very low with this lens.
http://www.photozone.d​e ...19-canon_85_18_5d?start=1external link

Post #2, Jun 02, 2010 11:18:50


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tkbslc
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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 .

Post #3, Jun 02, 2010 11:20:18


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Poe
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gjl711 wrote in post #10288819external link
Post an example. CA should be very low with this lens.
http://www.photozone.d​e ...19-canon_85_18_5d?start=1external link

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.

Post #4, Jun 02, 2010 11:24:06


7D (RIP?) | Σ 17-50 2.8 OS | Σ 30 1.4 | 50 1.4 | TAMRON 60 2.0 | 85 1.8 | 70-200 2.8L IS II | 580EX | MT-24EX |

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CountryBoy
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Poe wrote in post #10288789external link
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.

Post #5, Jun 02, 2010 11:26:42


Hi

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Player9
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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.

Post #6, Jun 02, 2010 11:38:38 as a reply to CountryBoy's post 11 minutes earlier.


60D, EF-S 10-22mm f/3.5-4.5, EF-S 18-135mm 3.5-5.6 IS, EF-S 55-250mm f/4-5.6 IS, Tamron 17-50mm f/2.8, EF 28mm f/1.8, EF 50mm f/1.8, EF-S 60mm f/2.8 macro, EF 85mm f/1.8, 430ex, 220ex, Alien Bee B400 (2), Alien Bee B800 (2)

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yourdoinitwrong
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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.

Post #7, Jun 02, 2010 11:40:56 as a reply to Player9's post 2 minutes earlier.


7D2 w/ BG-E16, 7D w/ BG-E7, EF-S 10-22mm f/3.5-4.5, 24-105 f/4L, 70-200 f/2.8L IS II, 35 f/1.4L, 85 f/1.8
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Cheever
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Go in Lightroom, and decrease purple saturation....should work well unless your subject is rocking purple.

Post #8, Jun 02, 2010 13:07:24 as a reply to yourdoinitwrong's post 1 hour earlier.


Canon 5d mark2 | 35L 1.4 | 50L 1.2 | 85 1.8 | 100 2.8 macro | 70-200L 2.8 mark1 | ts-e 45 2.8

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Poe
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Cheever wrote in post #10289502external link
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.

Post #9, Jun 02, 2010 13:40:50


7D (RIP?) | Σ 17-50 2.8 OS | Σ 30 1.4 | 50 1.4 | TAMRON 60 2.0 | 85 1.8 | 70-200 2.8L IS II | 580EX | MT-24EX |

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irishman
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Mine was awful, especially on specular highlights and high contrast areas.

Post #10, Jun 02, 2010 14:32:38


6D, G9, Sigma 50 1.4, Sigma 15mm Fisheye, Sigma 50 2.8 macro, Nikon 14-24G 2.8, Canon 16-35 2.8 II, Canon 24-105 f/4 IS, Canon 70-200 2.8 IS, tripod, lights, other stuff.

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bohdank
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Since I don't shoot chrome or barcodes or water with it, the PF rarely rears it's ugly head.

Post #11, Jun 02, 2010 15:10:06


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toxic
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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.

Poe wrote in post #10289698external link
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.

Post #12, Jun 02, 2010 15:11:14




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bohdank
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:Not overexposing eliminates it, except for barcodes :lol:

Post #13, Jun 02, 2010 15:13:25


Bohdan - I may be, and probably am, completely wrong.
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CountryBoy
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bohdank wrote in post #10290221external link
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.

Post #14, Jun 02, 2010 15:18:51


Hi

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

Post #15, Jun 02, 2010 15:27:46


Canon 6D, BG-E13, 24-70 f/4 IS L, 70-200 f/4 IS L, 35 f/2 IS, 85 f/1.8, 135 f/2 L, 1.4X II, Kenko Tubes, ST-E3-RT, 600EX-RT X 2, 270EX II, AlienBees

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