Quote Originally Posted by Rlibersky
I finally got a 10"x20" made. A box inside a box. 14" lens to film distance. Looked at what I wanted to cover and found this was the best combination. Now I have to figure the best size hole. Any suggestions?
Overall, the optimum hole size (for best image sharpness) is generally found by dividing the square root of the focal length by 25, all measurements in millimeters. For 14 inches, that would give SQR(356)/25 = 0.75 mm, or about .030" diameter, which in turn will give f/470, about.