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#1 |
Junior Member
Join Date: Jun 2005
Posts: 29
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I am looking and for a Sigma lens with APO it is roughly $80 more, what is it? Thanks in advance!
www.natimage.com |
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#2 |
Member
Join Date: Feb 2005
Posts: 44
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#3 |
Senior Member
Join Date: Jun 2004
Posts: 1,611
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APO stands for Apochromatic.
It is a lens corrected for chromatic abberations in all three primary colours. (Helps to reduce this). CA is causedwhenthe lens can't focus different colours on the same focal plane, causing a 'colour fringe' around objects. Whether or not it's worth paying extra for I can't say. But I can say my prosumer has an APO lens and I don't see any CA in my shots/prints. I'm sure someone else will add to this regarding your DSLR. Stevekin. |
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#4 |
Member
Join Date: Feb 2005
Posts: 44
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![]() The blue fringingaround the openings where the light background shows throughis an example of C.A. ![]() |
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#5 |
Senior Member
Join Date: Jun 2004
Posts: 1,611
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That's a good example Dave has shown. An APO lens will reduce the vast majority, if not all of this happening.
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#6 |
Senior Member
Join Date: Apr 2005
Posts: 323
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If you plan on doing anything beyond looking at your own pictures, I would highly recommend a lens that is apochromatic. Otherwise, people will ask you why on earth every bright area in your pictures is edgedwith violet. And, being that you're into nature photography, it's probably even more important, as you'll be taking pictures in sunlight, which makes CA more likely.
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