How to test a new (Ultra Wide) lens - Sigma 8-16mm?

Started 6 months ago | Discussion thread
Leonard Shepherd
Veteran MemberPosts: 6,721
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Re: ????
In reply to scrane, 6 months ago

scrane wrote:

Obviously he needs to check longer focus distances. Perhaps a distant brick wall??

Most brick walls are geometric patterns.

Geometric patterns can (as distinct from always will) result in poor AF accuracy

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Leonard Shepherd
Many problems turn out to be a lack of intimate knowledge of complex modern camera equipment.

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