>===== Original Message From William Erickson <erick...@hickorytech.net> ===== >For what it's worth, the optimal size pinhole for a 20 foot tube would be >0.114 inches, or an eighth of an inch.
>----- Original Message ----- >From: "chad white" <chadwh...@mac.com> >> >> do i have to paint the inside of the pinhole camera black? i am going to >> use a 20 foot tube and i dont know if i can get to all of it inside. i >> bet i lose image if i dont. maybe i should be writing to nailhole >> discussion... the f stop is going to be insane. That's an f 2105, about 14 stops larger then f16. 14 stops is 16384 times exposure. If you needed 1 second at f 16 you would need to expose for about 4.5 hours at f 2105. Hope you have a good tripod for that tube. Chris Peregoy pere...@umbc.edu http://userpages.umbc.edu/~peregoy
