090909 Vc Upp

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090909 Vc Upp

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

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