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05-30-2010, 08:16 PM   #1
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Why DA 17-70/F4 has no ED glass?

Recently thinking replace my kit lens to 17-70. As I know, all SDM lenses using ED glass for better color rendering except this one.

Anyone has idea? Thanks

05-30-2010, 08:31 PM   #2
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Perhaps because they were able to get the image quality they needed without reverting to ED glass.
I used the 17-70 for a few days just after it's release and found no issues with it's colour rendering, nor have I heard of any complaints with the way it renders colour.
I believe ED glass is used primarily to help control certain optical aberrations, and has little, if anything, to do with colour rending.
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