Hmm, looking over this, I realize the image/the light circle isn’t large enough to cover the film. D’oh!
This is more like it, though I think I need to look over the calculations more closely. They don’t jibe with some others I have seen.
The most important calculation is Rayleigh’s equation that specifies the optimum size of the aperture, given a focal length (hat tip). For a focal length of 1 inch (25.4 mm), the optimum aperture size is 22 microns. You can also work out the reciprocal length if you have a pinhole in hand already. I thinking I work from the pinhole out, drilling it first and seeing what I come up with — or buy one — before I do anything else. Of course, none of that tells you what size image is created as a result. This looks like it would help — if I could run it.
The more I learn the less I know, it seems.
Now playing: Allegro ma non troppo, un poco maestoso by CSO-Fritz Reiner from the album “Beethoven: Symphony No. 9, Op. 125, ‘Choral'” | Get it