DelRosario, Tom wrote:
I use the 500D and the reason I chose it over extension tubes is that I
use it with a zoom lens. I was told that zooming with an extension tube
completely messes up focus, while zooming with a diopter changes focus a
little, but not much, and mainly changes the magnification.
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I use extention tubes with zoom lenses often. I think whoever told you this
wanted to sell you a 500D.
The one thing they did not tell you is that the added glass degrades (albeit
minor) the image since it adds 2 more glass to air surfaces while the
extention tube does not.
Peter K
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