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

Started Nov 14, 2012 | Discussions thread
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Re: How to test a new (Ultra Wide) lens - Sigma 8-16mm?
In reply to slimandy, Nov 16, 2012

slimandy wrote:

scrane wrote:

I have had good luck with bookshelves. The correct focus plane can be adjusted so that shelves and rails show no perspective "distortion". I have never seen a camera that can't focus on a book's spine.

This is just a preliminary test to show unbalanced resolution across the field.

But would you know if soft corners were due to field curvature or were actually soft corners? Can you tell how this lens will perform when shooting landscapes? I would be more interested in how it coped with landscapes than bookshelves.

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Well, you can offset focus and see if corner resolution improves.

Please read my disclaimer. Obviously he needs to check longer focus distances. Perhaps a distant brick wall?? 

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