Testing sharpness of adapted 24x36 SLR lenses

Started Sep 20, 2017 | Discussions thread
mapgraphs
mapgraphs Senior Member • Posts: 1,218
Re: Why OOF PSF, focal reducers, and teleconverters

ProfHankD wrote:

It turns out the most common lens defect on FF is... drumroll please... vignetting wide open.

Really?

Vintage fast glass is designed to vignette. Old formulas were primarily concerned with a framed sharp center. Vignetting is one way to place attention on the center. Even coma is a design consideration.

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