[summerbee]

The 0.2mm pinhole should be fine for about 40 to 50mm focal length. Some of us prefer such wider coverage in pinhole photography.

agree, me too, my doubt was circle wouldn't cover image frame.

let's suppose i'd set a focale length of 43/44mm, that is roughly the half of the negative diagonal (87mm), what would be the conseguent viewing angle?

another dumb question: i know the process to create a "sport viewfinder" (a frame of the correct dimension in the correct place); is there any simple way to build up or to reuse any optical VF?

thx again you all.