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j_riederer · Jul 10, 2005, 11:32 AM

I am looking and for a Sigma lens with APO it is roughly $80 more, what is it? Thanks in advance!

www.natimage.com

Dave Chrismer · Jul 10, 2005, 2:29 PM

apochromatic
[line]

A lens or optical system virtually free of chromatic aberration,

Stevekin · Jul 10, 2005, 2:41 PM

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.

Dave Chrismer · Jul 10, 2005, 2:45 PM

The blue fringingaround the openings where the light background shows throughis an example of C.A.

Stevekin · Jul 10, 2005, 3:16 PM

That's a good example Dave has shown. An APO lens will reduce the vast majority, if not all of this happening.

G35Guy · Jul 10, 2005, 3:35 PM

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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Jul 10, 2005, 11:32 AM	#1
j_riederer Junior Member Join Date: Jun 2005 Posts: 29	I am looking and for a Sigma lens with APO it is roughly $80 more, what is it? Thanks in advance! www.natimage.com

Jul 10, 2005, 2:29 PM	#2
Dave Chrismer Member Join Date: Feb 2005 Posts: 44	apochromatic [line] A lens or optical system virtually free of chromatic aberration,

Jul 10, 2005, 2:41 PM	#3
Stevekin Senior Member Join Date: Jun 2004 Posts: 1,611	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.

Jul 10, 2005, 2:45 PM	#4
Dave Chrismer Member Join Date: Feb 2005 Posts: 44	The blue fringingaround the openings where the light background shows throughis an example of C.A.

Jul 10, 2005, 3:16 PM	#5
Stevekin Senior Member Join Date: Jun 2004 Posts: 1,611	That's a good example Dave has shown. An APO lens will reduce the vast majority, if not all of this happening.

Jul 10, 2005, 3:35 PM	#6
G35Guy Senior Member Join Date: Apr 2005 Posts: 323	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.