I suspect my 28-135 IS to be an almost good copy.
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.
|Louvre Museum pyramid by Didier Quan|
|Oka Frozen Leaf 2002 DP by MarioSS|
from The Dead Leaves of Winter