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View Full Version : Reducing chromatic aberrations?



kisner
02-23-2011, 01:22 PM
Hey all,

First time poster here :) Completely new to the DSLR world, purchased a canon t2i lens w/ the 18-55 kit lens about a month ago. Also purchased a 50mm f/1.8 from a friend for $50 (which I have to say is REALLY sharp for the price). My father also gave me a 35-105mm 4.5-5.6 old push-pull canon lens, so I have a good bit of range in my lenses.

I've noticed I have been getting a good deal of chromatic aberrations, particularly at night, as well as with day shots in the snow. Is there any technique (aside from the post processing methods) to reduce these? Many times it is something only I notice, but if someone were to pay real close attention they would see it too...and I'm my own worst critic. And if I ever want to make prints of stuff, I don't want these. (Please look at the originals if you can't see what I'm talking about.)

Some examples:
http://farm6.static.flickr.com/5179/5467576831_e72a8bbcd5_z.jpg
I don't know if you can tell on this photo, but along my dogs outline, bottom half, leg and stomach in particular, it is pretty heavy. Is this something that is unavoidable with a cheap kit lens? (shot with the 18-55) Here (http://farm6.static.flickr.com/5179/5467576831_f28882400b_o.jpg) is a link to the original so you can zoom in and see.


http://farm6.static.flickr.com/5019/5422606013_ced509f315_z.jpg
In this photo, you'll notice it's very apparent around the flamingo's head/neck region. Here (http://farm6.static.flickr.com/5019/5422606013_9e8c1c6271_o.jpg) is the original.
The flamingo was taking with an old 35-105mm f/4.5-5.6 push-pull zoom that my father had laying around.

http://farm6.static.flickr.com/5094/5418624567_8a12b0d1dc_z.jpg
Again, mostly on the stomach of the duck facing the hard reflected light off the snow...not as noticeable in this photo until you look at the original. This was shot with a 50mm @ 1.8 (http://farm6.static.flickr.com/5094/5418624567_b0bfb84a9a_o.jpg)


Last one, one of the first shots I ever took:
http://farm5.static.flickr.com/4112/5414507457_37c5617afb_z.jpg
Also shot with the 18-55 kit lens. Very apparent aberrations in the outer white portions of the building and where the white meets yellowish color -- Original (http://farm5.static.flickr.com/4112/5414507457_09f5b44c3c_o.jpg)


Now, is this something that is happening as a result of a cheap lens build as far as optics quality? Is there anything I can do to eliminate this or some kind of technique to reduce this without resorting to post processing methods? It's nice to be able to clean stuff up afterwards, but I'd rather improve my skill as a photographer and eliminate such unnecessary things. This doesn't happen in ALL my snow photos, so I feel it is somewhat preventable (maybe depending on light/sun positioning? I know shooting midday is a terrible idea).

Thanks all :)