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F11 lens with 2x TC = F22?

Started Aug 5, 2020 | Questions thread
makofoto Contributing Member • Posts: 534
Re: F11 lens with 2x TC = F22?
1

I'm not great with Math but I though Diffraction occurs when you have a physically small opening, aperture, and the light at the edges of the opening "wraps" ... and is no longer moving in the same straight lines as it was before passing through the restriction? Thus creating an interference, which diminishes the acutance.

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