Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
JimKasson
JimKasson Forum Pro • Posts: 26,539
Re: Bench testing
1

slstr wrote:

Out of curiosity, just how tall and wide would said wall and iso chart have to be at 500 meter distance to fill the frame with a 35mm lens on full frame ? Something like the Hoover dam?

Lemme think.

A 35mm lens on a FF camera has a FOV of 37 degrees horizontally. Half that is 18.5 degrees. Tangent of 18.5 degrees is 0.33. So the half-width is 500*0.33 = 167 meters. And the full width is 333 meters. I didn't make a diagram, just set it up in my head. Did I do it right?

Jim

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