PINHOLE
CALCULATOR


Use this table to determine the optimum pinhole size for a given focal length,
or the optimum focal length for a given pinhole diameter.

Focal Length/inches Diameter/inches F/Stop needle drill bit
2.36 0.014 165 12 80
2.76 0.015 178   79
3.15 0.017 190 11 78
3.54 0.018 202 10 77
3.94 0.019 213    
4.72 0.020 233   76
5.51 0.022 252 9 75
6.30 0.023 269   74
7.09 0.025 285 8 72
7.87 0.026 301   71
8.66 0.027 316 7  
9.45 0.029 330   70
10.24 0.030 343   69
11.02 0.031 356 6 68
11.81 0.032 369   67
12.60 0.033 381   66
13.39 0.034 392 5  
14.17 0.035 404   65
14.96 0.036 415   64
15.75 0.037 426 4 63

f-stop = focal length/diameter
Film surface coverage is based on an angle of 50 degrees
(inclusive, 25 degrees left/25 degrees right) from pinhole center.


EXPOSURE
CALCULATOR

( This table is based on a pinhole camera that incorporates the following qualities );


(NOTE! Utilizing PHOTOGRAPHIC paper in the camera, instead of film,
allows you to skip the entire NEGATIVE process! You will only need
chemicals to develope the papers POSITIVE image.)

FULL, VERY BRIGHT sunlight conditions
(Such as a background of sand or snow)
15 seconds
Hazy Sun
(distinct shadows)
30 seconds
Cloudy
(no shadows)
60 seconds
Overcast 2 minutes
Heavy Overcast 4 minutes


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