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# 090909 Vc Upp

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• 1.
• 2. Nesting boxes, for example
• 3. Cut overlapping holes in both top and bottom boxes
• 4. Cut flashing, or other thin metal, larger than opening in box.
• 5. Pin or needle to “drill” hole.
• 6. Try to get hole diameter near .5 mm
• 7. Sand down any rough burrs around hole.
• 8.
• 9. Tape aperture to inside of box with matte black photo tape.
• 10. Paint inside of box (top & bottom) MATTE black. Protect aperture while doing this.
• 11.
• 12.
• 13.
• 14.
• 15.
• 16.
• 17. Side cross section
• 18. Tape, or otherwise secure, film to back of box.
• 19. Image Path
• 20. Focal Length, F, used in calculation of f#.
• 21. Focal Length, F, used in calculation of f#. f#= F/aperture diameter Example: F=Distance from aperture to film plane = 8 inches Aperture 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
• 22. f406
• 23. f406 Our meter tells us our bright daylight scene requires an exposure of f22 @ 1/30 sec
• 24. 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
• 25. 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
• 26.