Quote Originally Posted by Vaughn View Post
Should only be slight less than 7" (sq root of 47) from the pinhole to the corner -- there will be some falling off of the light, but probably less than people usually burn down the corners/sides when enlarging standard negatives. Six inches should give about a normal view on 4x5.

I did hear about a fellow who use to sell pinholes -- the edges of the holes were actually micro-filed to a knife edge. No other info, I am afraid.
Might have been me, Vaughn. I'm no longer interested in actively selling them because I don't really enjoy working for $5/hour, especially because my eyesight isn't what it used to be, but I do make one now and then for somebody.

However, somewhere on APUG is a detailed description of my current method, which is the best yet, if anyone is crazy enough to try it.