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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Apr 2013 (Monday) 20:53
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Chromatic Aberration & Fringing

 
samefly
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Apr 08, 2013 20:53 |  #1

I've used multiple lenses of various brands (none in the L or comparable area) and with all of them I often get CA and fringing around tree leaves. Sometimes building edges and flags waving against the sky as well. I can often correct some of the appearance using Lightroom but that's not always a pleasing fix. Is there something I can do while shooting to help reduce this?


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sapearl
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Apr 08, 2013 20:57 |  #2

Are you absolutely certain it's the lens? A lot of inexpensive lenses will cause this to one degree or another, and even some of the L's. Are you using a filter? That can contribute to the problem if it's a cheap one. A hood can help the situation somewhat as it will protect the front elements from extraneous side lighting.


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samefly
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Apr 08, 2013 21:15 |  #3

sapearl wrote in post #15805713 (external link)
Are you using a filter? That can contribute to the problem if it's a cheap one. A hood can help the situation somewhat as it will protect the front elements from extraneous side lighting.

I pretty much always use a lens hood but I have not used any filters. Would a good UV filter help reduce this?


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Apr 08, 2013 21:21 |  #4

samefly wrote in post #15805785 (external link)
I pretty much always use a lens hood but I have not used any filters. Would a good UV filter help reduce this?

That's good you're using the hood - think of a pitcher on the mound on a bright sunny day, and how he'll fold the brim of his hat to shade his eyes........just like a lens hood ;).

No, I don't think a filter will help; I suspect in some cases it will even make it worse. I believe it has everything to do with the angle at which the intense light hits the elements.


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Apr 08, 2013 21:27 |  #5

Btw - really interesting grafitti art in your gallery. Does the work usually remain intact for a while or do folks tag over it pretty quickly?


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samefly
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Apr 08, 2013 21:37 |  #6

sapearl wrote in post #15805804 (external link)
No, I don't think a filter will help; I suspect in some cases it will even make it worse. I believe it has everything to do with the angle at which the intense light hits the elements.

Guess next time I'm out I try taking multiple shots using very slight shifts/tilts and see if that helps. Been a little frustrated with having a composition I love and then get home and see all the CA/fringing


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Apr 08, 2013 23:40 as a reply to  @ samefly's post |  #7

First thing I did was try to figure out how old you are. The reason is that CA on lenses is better than it has ever been but almost every lens has some, especially non-telephoto zooms. For instance the 24-105L, 17-40L and 'L-like' 10-22 are almost as bad as the kit 18-55IS (comparing corners on crop to corners on FF though).

In the past (pre-digital) it was less noticeable because a lot was done in B&W and you had to print color quite large to see it. However, now we can pixel-peep it can become much more obvious and in the age of digital 'perfection' it becomes less acceptable.

I now look at old color prints and can immediately see the CA and yes it is annoying. Anyone who does not PP digital images never notices it.

However, if you can still see it on a computer screen (full image, not zoomed) or 'reasonable' sized print (20" or less) after correction, than I would submit that you could probably do better in PP.


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Apr 09, 2013 01:33 |  #8

are these effects ever acceptable or help a photo ? CA and Fringing for the effect they cast ?


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Apr 09, 2013 09:24 |  #9

ROGERWILCO357 wrote in post #15806609 (external link)
are these effects ever acceptable or help a photo?

No.

For me personally, CA and fringing are the most distracting things an image can have. I would rather have a slightly out-of-focus image with zero CA than a tack-sharp image with it.


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Apr 10, 2013 02:07 |  #10

If you post process in Lightroom 4.3 , removing the purple fringing is easy and just takes a few seconds. Purple or green fringes should be no longer a concern if you post process.


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Apr 10, 2013 09:07 |  #11

I do use LR4 and I still find it annoying and troublesome.

Everybody has different tolerances for CA and mine is exceedingly low.


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Apr 10, 2013 09:17 |  #12

mclaren777 wrote in post #15811372 (external link)
I do use LR4 and I still find it annoying and troublesome.

Everybody has different tolerances for CA and mine is exceedingly low.

CA in the lens is what gives the desired bokeh people want. Without it, the bokeh will look more harsh. It's a trade off for lens designers.


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Apr 10, 2013 09:20 |  #13

Why not just make the removal a default action for that lens? Anytime you import images with that lens the CA will be gone automatically.


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airfrogusmc
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Apr 10, 2013 09:27 |  #14

snake0ape wrote in post #15811401 (external link)
CA in the lens is what gives the desired bokeh people want. Without it, the bokeh will look more harsh. It's a trade off for lens designers.

You haven't seen the images from the 200 2L then. The bokeh is as good as it gets (better than my 85L) and virtually no C/A. THe 300 2.8 and the 400 2.8 are also almost C/A free.




  
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Apr 10, 2013 14:16 |  #15

its very easy to remove in post, is the lens profile doesn't get rid out it you can manually adjust or even pull down the individual color channels.

seriously i used tamron 10-24 that CA'd like crazy and it was simple to remove.


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