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This
is a guide for making a pinhole camera using regular sewing
needles (not sewing machine needles; drill, don't puncture).
Tables by Jim
Shull from his book
"The Hole Thing", Morgan and Morgan, 1974.
Sewing
Needle Number |
Needle
Size |
Best
Distance Focal Length |
F-Stop |
4 |
.036" |
20" |
f/550 |
5 |
.031" |
15" |
f/490 |
6 |
.029" |
13" |
f/450 |
7 |
.026" |
10" |
f/390 |
8 |
.023" |
8" |
f/350 |
9 |
.020" |
6.5" |
f/300 |
10 |
.018" |
5" |
f/280 |
12 |
.016" |
4" |
f/250 |
13 |
.013" |
2.5" |
f/190 |
F-Stops (focal stops) are simple ratios between the size
of the opening (hole) and the distance from the opening
to the film plane.
Table
for Number 10 Needle |
Distance
from opening to focal plane |
F-Stop |
4" |
f/220 |
5" |
f/280 |
6" |
f/330 |
7" |
f/390 |
8" |
f/440 |
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