I suspect my 28-135 IS to be an almost good copy.

Started Oct 13, 2005 | Discussions thread
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SkyTamer
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I suspect my 28-135 IS to be an almost good copy.
Oct 13, 2005

How can I test it?

I searched previous postings and have found so many tests, but these seem to be specific of some lenses, or partially inclined to test a specific aperture. Is there a "design" test for this lens?

Tried the Canon site with negative results.

R

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