I have the Canon 10-22mm, and while the sharpness is great, the chromatic aberration is NOT. I was wondering if this is common among all wide angles, or if it's just more pronounced in this lens. I'm seriously thinking about the Tokina 12-24 as a replacement, but don't want to sell the Canon if it's the same with all these lenses...
Amy, I own the 10-22 and haven't noticed any distinct problems. When is the chromatic aberration most pronounced?
Posted by Basil Greber on April 18, 2008 at 8:02 AM
The Tokina also features a fair share of CA, so I don't think you can eliminate the problem. All ultrawides show some CA, some more, some less, but AFAIK the Tokina is one of the "worst" in this category (still, I happily use it on my Nikon DSLRs).
Basil
Posted by Kent Staubus on April 18, 2008 at 8:50 AM
I bought the Sigma because all the reviews said it has the least problem with CA.
I've got the Tokina and haven't had pronounced problems with CA. It's fairly new and I'm still working with it but I'm pretty happy.
j.
Posted by Mel Ladewig on April 18, 2008 at 3:16 PM
Amy, ultra wide angles do seem to be more prone to chromatic aberration than some other focal length, but my 10-22 is not terrible. I've had my 10-22 for a year. This problem also occurs with my 4X5. My 65mm super angulon (equivalent to 12mm on a crop sensor) exhibits some CA, but my normal focal lengths do not.
The CA I'm seeing with mine is roughly 2-3 pixels on a Rebel XT in the corners when high contract comes into play. If you're CA issues are greater than this you might consider sending the lens to canon for warranty work.
BTW, I've found that software can help reduce this CA significantly. ACR 4.X did a pretty good job when I tried it. But I've heard that DXO is excellent for these issues.
Benjamin, I notice the CA most when shooting trees against the sky. It's usually bluish/purplish and really frustrating...
Mel - what's DXO? I'm looking for something to use...
Thanks, guys!
Posted by Steve Foss on April 18, 2008 at 11:38 PM
Amy, that's the type of CA most call purple fringing. I still haven't upgraded to CS3, but my CS2 has an option to correct for CA on the RAW preview screen when opening RAW files. I've rarely had issues with CA with the lenses I've used, but when I've had some images with purple fringing, CS2 has done a decent job correcting for it.
When CA is present, adding much saturation, contrast and sharpening in pp accentuates it.
In some cases when toning images for newspapers that had accepted submitted jpegs with purple fringing, I've gone in and cloned out the fringing. Takes time and can be painstaking, but it does work.
Discussion
7 repliesBasil
Kent in SD
j.
The CA I'm seeing with mine is roughly 2-3 pixels on a Rebel XT in the corners when high contract comes into play. If you're CA issues are greater than this you might consider sending the lens to canon for warranty work.
BTW, I've found that software can help reduce this CA significantly. ACR 4.X did a pretty good job when I tried it. But I've heard that DXO is excellent for these issues.
Benjamin, I notice the CA most when shooting trees against the sky. It's usually bluish/purplish and really frustrating...
Mel - what's DXO? I'm looking for something to use...
Thanks, guys!
When CA is present, adding much saturation, contrast and sharpening in pp accentuates it.
In some cases when toning images for newspapers that had accepted submitted jpegs with purple fringing, I've gone in and cloned out the fringing. Takes time and can be painstaking, but it does work.