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