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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Jan 2011 (Sunday) 13:49
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400 5.6 problem?

 
noahcomet
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Jan 30, 2011 13:49 |  #1

I've had the 400 5.6 for a long time and never had any issues, but a birder friend asked me to try his, because he feels there might be something wrong with it. I slapped it on my 7D and got a nice shot of my resident neighborhood Cooper's Hawk. While I feel like the focus is OK, there seems to be something going on with the purple-and-green coloration on the branches. Is this a problem with the lens? (Fringing? I seem to recall hearing about that.)

The picture's been cropped and downscaled, but I've left the colors alone.


As for the focus, this was a distant bird filling maybe 1/10th of the frame; considering that, I think it's ok, right? Mine might do a little better, but it's hard to say.

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mikeassk
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Jan 30, 2011 13:54 |  #2

That's the situation it would occur... It looks a bit harsh to me


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noahcomet
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Jan 30, 2011 13:59 as a reply to  @ mikeassk's post |  #3

As you can probably tell, it's a dark bird against a bright overcast sky---this isn't a photo that's going to win any awards :) But is that a particular situation in which fringing is likely to happen? Is there any way to remedy this?


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Mike ­ K
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Jan 30, 2011 14:06 |  #4

I notice the tree buds/branches that are just in front of the hawk are a different color/shade than those against the bight sky/clouds. This is typical of your camera/ens struggling with high contrast detail and is likely associated with your observed fringing. This could be due of chromatic abberation, CA. If you are shooting RAW, when you convert the RAW in DPP there is the opportunity to correct CA with a slider and R&B channels.


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JeffreyG
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Jan 30, 2011 14:08 |  #5

These LOCAs are totally normal. You have extreme high contrast items that are outside the plane of focus both near and far. All lenses will do this generally.


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noahcomet
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Jan 30, 2011 14:10 |  #6

OK, I thought perhaps that might be the case. Funny, my Elements RAW editor has always been my go-to---I never even installed DPP, but perhaps I ought to use both, since the Canon RAW tool doesn't have the CA adjustment, as far as I can tell.
Thanks!


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400 5.6 problem?
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