>> "Ken Durling" <[EMAIL PROTECTED]>
>> How do you check for decentered elements?
-From: Julian Loke <jul.loke@utoronto
>A gross test is to look for impact damage on the barrel, and
>confirmed by shaking the lens and listen for glass rattling
>inside or bits falling out......Check for uneven sharpness, or asymmetrical
>internal reflections. And for sharp focus shifting around the frame during
focussing.
>And for shifts occuring when the lens is rotated unlocked in the
>EF bayonet mount.
Kind of makes me wish I could take Julian with me when I look at used
lenses!!!
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