For those who are interested, I wrote a little program that can be used on mobile devices that support the powerOne app. This is a calculator platform that allows for customization or programs that can be written by end-users. Once you purchase the calculator, I think it costs five bucks, you can search for the program I wrote. It is called Optimal Pinhole Diameter. Basically, you select the Film Size, enter the Focal Length (in mm), enter Light Wave Length (in mm), and the Rayleigh Constant. You are then shown the Sqrt. of Airy Disk Size in mm and the Pinhole Size (which is the same number, I need to update this). You are also shown the f/stop, Image Diameter, Film Diagonal, Angle of View and whether there will be Vignetting. I welcome your comments.