How do you manufacture a nice pinhole for 4x5 or 8x10? How is desired focal length accounted for (I know a pinhole doesn't have a focal length per se, but I've heard there's an optimum diameter for a given focal length). I'd like it to give a well defined image with only a little bit of that pinhole softness. It should have full 4x5 coverage & ultra wide angle. After losing out on a 65mm on ebay ($500 was my max, wishful thinking I might add) I've figured the only way to reasonably afford to go very wide on my LF is to make a pinhole. Any tips would be great. I've looked at some of the pinhole resources but they don't usually give a simple straightforward answer to these things nor indicate how to get reasonably detailed ('sharp') images. I'd almost buy a nice laser-drilled precise plate if needed. Where would I get one suitable for LF?