I rented the 85L to shoot a wedding and quickly realized that you have to shoot without any comp (especially if you open it up a little bit) or else you get bad CA when shooting anything too contrasty.
PetKal wrote:
Yes, and more......all the way up to f/2.2 my 85L MkI is quite susceptible to purple/green fringing.
BTW, very nice portrait of a very pretty girl.
Thanks... she is ten years old. What bothers me even more is that none of the CA sliders in Lightroom has any effect whatsoever on that fringing... with all other lenses, it is usually a breeze to get rid of CA in Lightroom.
slobodan wrote:
Thanks... she is ten years old. What bothers me even more is that none of the CA sliders in Lightroom has any effect whatsoever on that fringing... with all other lenses, it is usually a breeze to get rid of CA in Lightroom.
If you head over to the Post Processing Forum, there are lots of really great techniques people can show you to clean up CA's like that in PS.
slobodan wrote:
Thanks... she is ten years old. What bothers me even more is that none of the CA sliders in Lightroom has any effect whatsoever on that fringing... with all other lenses, it is usually a breeze to get rid of CA in Lightroom.
yeah front/back CA is harder to correct
most fast canon lenses are not full APO designs so they only shift up blue to red and leave green behind so you get magenta in front of focus and green behind it
the canon super-tele are fully correct, as appear to be the macro lenses
it varies in degree lens to lens the 50 1.4, 85 1.8, 85 1.2, 135 2 certainly have it noticeably
slobodan wrote:
What bothers me even more is that none of the CA sliders in Lightroom has any effect whatsoever on that fringing... with all other lenses, it is usually a breeze to get rid of CA in Lightroom.
Those sliders only fix lateral CA.
You're seeing what I think is correctly called spherochromatism. Longitudinal CA is corrected in the focal plane, but outside the focal plane it's not. It seems to be a result of a complicated lens trying to correct a lot of stuff while ignoring this issue. I don't believe that the cheapie Canon EF 50mm f/1.8 has this issue.
For the price of an "L" lens, one is entitled to expect more perfection, in my worthless opinion.
Daan B wrote:
Try it @ f/1.2... if you think this is a bad case of CA
Just to make sure there is no misunderstanding, the original shot was done with a 40D and 85/1.8 lens (i.e., not the "L" one). The reason I titled this thread as a question for 85/1.2 owners is to basically ask if shelling out $1500 more for the "L" lens would eliminate or reduce the problem with CA... based on the replies so far, it seems it would not, unfortunately. Furthermore, given that the above shot is done with a crop sensor, it seems logical that on a full frame the CA would be even more pronounced.
slobodan wrote:
Furthermore, given that the above shot is done with a crop sensor, it seems logical that on a full frame the CA would be even more pronounced.
No, just the opposite seems logical. A green fringe with a width of 20 microns would cover a greater percentage of the picture area on an APS-C camera than on a FF camera.
I once saw on a web site a set of images of a mannequin head shot with the 85 1.8, the 85 1.2L I, and the 85 1.2L II, and the CA diminished progressively with price. I would expect that you'd have had less of it with the 1.2 II at the same aperture. (That would qualify as my worthless opinion.)
Ernie Aubert wrote:
I once saw on a web site a set of images of a mannequin head shot with the 85 1.8, the 85 1.2L I, and the 85 1.2L II, and the CA diminished progressively with price. I would expect that you'd have had less of it with the 1.2 II at the same aperture. (That would qualify as my worthless opinion.)
BTW, he writes in the above review comparing the 85 1.8, 85L and 85L II: Birefringence patterns produced from f/1.4 to f/4 with the 3 lenses on an EOS-1Ds Mark II are shown here. No differences among the lenses were detected in birefringence induced in metallic/reflective objects at wide apertures with the three lenses using the 1Ds Mark II or an EOS 20D (20D images not shown)
Not to be insulting, I'm just surprised people worry about this much CA in their pics. I mean, its hardly noticeable at 100%, something you wont see in a print. // end rant
