HandMade Photographic Images

Pinhole Apertures

The values below are calculated by the formula offered by Bob Dome:

         ______
  R  =  V  WCF

  where R = radius of aperture
        W = wavelength of light
        C = constant
        F = focal length
    

The focal length is determined by dividing the focal length by the pinhole diameter.

Millimeters
Focal Length Pinhole Diameter F Stop
10.11884
20.16120
30.20146
40.23163
50.26189
60.29207
70.31224
80.33240
90.35254
100.37267
110.39281
120.40293
130.42305
140.44317
150.45328
160.47338
170.48349
180.50359
190.51369
200.52378
210.54387
220.55397
230.56406
240.57415
250.59423
260.60431
270.61440
280.62448
290.63456
300.64464
Inches
Focal Length Pinhole Diameter
in 1/1000ths
F Stop
17.4135
210.5190
312.8234
414.8270
516.6301
618.2330
719.6357
821.0381
922.2405
1023.5426
1124.6447
1225.7467
1326.7487
1427.7505
1528.7523
1629.7538
1730.6556
1831.5571
1932.3588
2033.2602
2134.0618
2234.8632
2335.6646
2436.3661