How to fully test a 24-70mm f2.8?

Started Jan 18, 2013 | Discussions thread
Zolty
Regular MemberPosts: 198
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Re: How to fully test a 24-70mm f2.8?
In reply to wint, Jan 23, 2013

If you are lucky one correction value will do for all focal lengths and all distances, but if you are not.... required correction will be focal and distance dependant.

My 70-200 requires 0 correction, 24-70 requires +10 only at 70 mm (remaining focal at 0),

my worst case is 14-24: corrections change between +7 and -20 - different for 14mm and 24mm, different at short distances and long distances. Lens qualifies for servicing, and I can not find proof of purchase so warranty does not apply for the moment.

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