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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 12 Sep 2010 (Sunday) 15:26
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Canon Fix for Excessive CA - Calibration or Adjustment

 
Mark_48
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Sep 12, 2010 15:26 |  #1

I have a 24-70L lens that I've had a few years and after some recent comparisons to a couple other lenses, it appears to have more red fringing than I would expect from an L series lens. It's probably been like this since I bought it and just recently shooting at f/2.8 of some high contrast shiny objects it became quite noticeable.

Anyhow I'm likely going to send it off to Canon to hopefully get it corrected. I am wondering if CA is corrected by a "calibration" or adjustment of the lens elements, and what might I expect for an estimate to correct it. I'm in the US on the east coast, so it will likely be sent to New Jersey.


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malla1962
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Sep 12, 2010 16:01 |  #2

Not sure how they will correct it, I think in some conditions it is prone to it, mine is quite bad in certain conditions.


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WhyFi
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Sep 12, 2010 21:19 |  #3

Post some examples - there may not be anything to correct; there are very few lenses that show no CA under those circumstances.


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philwillmedia
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Sep 12, 2010 22:00 |  #4

CA can't be corrected.
Nearly every lens will show some degree of CA giben the right conditions.
It is a characteristic of the lens with some lenses producing more CA than others.


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toxic
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Sep 12, 2010 23:22 |  #5

CA is controlled by the glass coatings and the placement of the lens elements...maybe the elements are off misaligned too much, or maybe you expect too much...




  
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Mark_48
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Sep 13, 2010 08:15 |  #6

WhyFi wrote in post #10897100 (external link)
Post some examples - there may not be anything to correct; there are very few lenses that show no CA under those circumstances.

Here's a test shot full sized and then with a crop of the problem. I tried several other lenses and only a Sigma 70-200 had some slight purple fringing, the rest really had no evidence of any CA. Yeah, if I shoot RAW I can remove it, but with a lens such as this, I just didn't think the CA should exhibit itself this much.
It is probably a harsh test example.

This was shot at FL=70mm, 1/160 @ f/3.5 ISO400. I have other shots at f/2.8 showing it slightly worse, this is just one that was on top of the heap that I grabbed quickly.


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Megapixels and high ISO are a digital photographers heroin. Once you have a little, you just want more and more. It doesn't stop until your bank account is run dry.

  
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maxwell1295
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Sep 13, 2010 08:31 |  #7

Try zeroing out the magenta and purple silders in LR. That's what I've done in some cases. Sometimes it works, sometimes it doesn't...


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Canon Fix for Excessive CA - Calibration or Adjustment
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