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Nesting boxes, for example
Cut overlapping holes in both top and bottom boxes
Cut flashing, or other thin metal, larger than opening in box.
Pin or needle to “drill” hole.
Try to get hole diameter near .5 mm
Sand down any rough burrs around hole.
Tape aperture to inside of box with matte black photo tape.
Paint inside of box (top & bottom) MATTE black. Protect aperture while doing this.
Side cross section
Tape, or otherwise secure, film to back of box.
Image Path
Focal Length, F, used in calculation of f#.
Focal Length, F, used in calculation of f#.
f#= F/aperture diameter
Example:F=Distance from aperture to film
plane = 8 inchesAperture diameter = .5mm
Convert inches to mm:(8 in) X (25.4 mm/in) = 203.2 mm
f# = 203.2mm/.5mm = 406.4
http://www.mrpinhole.com/holesize.php
f406
f406
Our meter tells us our bright daylight scene requires an exposure of f22 @ 1/30 sec
f406
Our meter tells us our bright daylight scene requires an exposure of f22 @ 1/30 sec
f22 f32 f45 f64 f90 f128 f180 f256 f360 f512
1/30 1/15 1/8 1/4 1/2 1 2 4 8 16
f406
Our meter tells us our bright daylight scene requires an exposure of f22 @ 1/30 sec
f22 f32 f45 f64 f90 f128 f180 f256 f360 f512
1/30 1/15 1/8 1/4 1/2 1 2 4 8 16
We will need an exposure time of approximately 10-12 sec
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