Ok so what is it that DO does that non DO doesnt do
calicokat Cream of the Crop  14,720 posts Likes: 2 Joined Oct 2005 Location: Southern California More info | Sep 10, 2006 20:03 | #2 Its the size of the lens, the 400 DO is the same size as the 300 F/2.8L IS. It stands for Diffractive Optics "You are going to fall off a cliff trying to get a better shot someday"- My hopeful and loving wife
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CyberDyneSystems Admin (type T-2000)  More info | Sep 10, 2006 20:14 | #3 Yes, using the ripples found in Fresnel lenses, "DO" can make a lens that is much smaller than one with conventional elements. GEAR LIST
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 | x 1600 |
| y 1600 |
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