[OM] Re: What is CA?

[Chuck Norcutt]

Caused by a difference in magnification based on wavelength.  The far 
ends of the spectrum (red and purple) get spread apart and (especially 
on high contrast areas) show up as red and purple fringing.  It's 
corrected by pulling the red and blue channel pixels closer together by 
a variable distance based on their distance from the center of the image.

Chuck Norcutt

ScottGee1 wrote:

> Chromatic Abberation
> 
> See:
> 
> http://www.dpreview.com/learn/?/Glossary/Optical/chromatic_aberration_01.htm
> 
> hth/ScottGee1
> 
> On 12/7/06, Ali Shah <alizookoman@xxxxxxxxx> wrote:
> 
>>When people say "many excellent lenses have CA". What
>>is CA?



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