>===== Original Message From William Erickson
<erickson@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" <chadwhite@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
peregoy@umbc.edu
http://userpages.umbc.edu/~peregoy
Received on Sun Jul 28 11:35:23 2002
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