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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Jul 2010 (Tuesday) 14:12
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24L II CA - is this acceptable ?

 
Ross_Curtis
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Jul 13, 2010 14:12 |  #1

Having had a 35L with various back/front focus issues I finally got it sorted. Even then I was never 100% happy, it just wasn't sharp enough (for me) wide open.

I've recently bought a 24L II and I am so happy with it. At 1.4 is it as sharp as it is at 2.2. I couldn't be happier, until I noticed the CA I was getting. My initial thoughts were, it's no big deal and easily removed in PS. However, I've started to reconsider this. Yes I can remove it in PS, but why should I, I've spent an incredible amount of money on this lens and it should be right, shouldn't it?
My worry is that if I send it back to Canon the focus might not be as good as it currently is, maybe I'm not giving Canon enough credit, but that's what bad past experience does.

I'm using it on a 7D (also in warranty) and have found that you often have to focus twice to get it spot on, something I have seen mentioned before. this isn't really my issue, but if I do decide to send my lens to Canon I may as well send in my 7D too.

I Just wanted a little advise as to whether this sort of CA is acceptable on this lens. The attached photo is a crop and shot at F1.6.

Thanks
Ross


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timnosenzo
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Jul 13, 2010 14:27 |  #2

Looks normal


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kinghong1970
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Jul 13, 2010 14:28 |  #3

i get it on my 50L @ 1.2... i should stay away from chromes... lol...

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kuwazome
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Jul 13, 2010 14:39 |  #4
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I just desaturate magenta and layer mask away, I highly doubt anyone will know :)




  
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Ross_Curtis
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Jul 13, 2010 14:45 |  #5

kuwazome wrote in post #10529169 (external link)
I just desaturate magenta and layer mask away, I highly doubt anyone will know :)

That's what I was doing so I never felt it was too much of an issue.

This post was sparked by the FEDEX delivered my 24L post which commented on the fact there was no CA.

Thanks for the input.


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kuwazome
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Jul 13, 2010 14:47 |  #6
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Look at the crops here:
http://www.the-digital-picture.com …&FLI=0&API=0&Le​nsComp=397 (external link)

If it has less than the 85 II, then I think you're good.

Btw from those crops, looks like 24 is less sharp than the 35, so you could possibly have a 35 thats a little off.




  
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timnosenzo
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Jul 13, 2010 14:51 |  #7

Ross_Curtis wrote in post #10529202 (external link)
This post was sparked by the FEDEX delivered my 24L post which commented on the fact there was no CA.

But there will be! :lol:


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jwcdds
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Jul 13, 2010 14:52 |  #8

There's CA. I'm sure there's some super magical lens out there that will let you shoot at f/1.4 without producing any CA under CA-inducing conditions. But I've never seen/heard of such a lens. So just fix it in PP and be happy with the sharpness. The holy grail of lenses that shoots f/1.4 does not appear to exist (for now).


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Ross_Curtis
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Jul 13, 2010 15:06 |  #9

Don't get me wrong I'm not complaining I just wanted to be sure I'm getting the most out of the lens.
In terms of sharpness I couldn't be happier. It's an amazing lens.


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24L II CA - is this acceptable ?
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