I will be drilling into very thin brass (not sure what thickness yet) and then drilling a wide flat bottom impression into the body cap (that has a small hole drilled through it) that the drilled brass will slip into, this way I can have several different size pinholes to experiment with. Still working on how to hold the brass plate into the body cap

Quote Originally Posted by Dr Croubie View Post
Just on the difference between drilling a cap and poking a piece of aluminium foil, the generally-accepted theory is that foil is best, because thickness matters a lot. Including the sanding, that's designed to make it as thin as possible. Here is a bit of an explanation of how it affects angle-of-coverage. I thought there was another effect on other things but my google is failing me, or maybe that's the only problem.

I'm thinking of my lens caps, they're generally 1-2mm thick, way too much for a real hole. If you weren't already going to, I'd drill a 10mm or so hole in the lenscap and attach a piece of foil or otherwise to that...

(Or take the lazy way out and buy a Skink Pinhole kit like I did)