Quote Originally Posted by Rich Ullsmith View Post
. . . Looking to replace all my pholes with fresh laser drilled. Can these be made with a +/- .01mm tolerance? I have all my cameras set to about f250, that is, I did the math for the hole-to-film plane distance, and I made a few dozen holes and selected the ones closest to make the math work. . . .
There is little need for pinhole diameter accuracy finer than several percent, even for critical pinhole photography. There is nearly a 2:1 ratio between the largest and smallest diameter pinholes commonly used for each focal length. Nor do the popular pinhole diameter calculators closely agree. Carefully made by hand pinholes can be as clean and accurate as laser drilled ones. More important is selecting the correct diameter for the focal length, color of the light used, angle of coverage, and magnification ratio.