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How is a pinhole camera different than a regular camera?

How do I calculate the fstop that my homemade 35mm pinhole camera has?

  • I made a working homemade 35mm pinhole camera out of cardboard, black electrical tape, aluminum foil, a marker (to color the inside black to prevent light from bouncing). The camera works fine. However, I don't know what the fstop is on my camera.

  • Answer:

    Camera guy's answer is technically correct, but it might be indefeasible to measure the size of the pinhole. You can also use this calculator: http://www.mrpinhole.com/calcpinh.php You can also do a few calculations on your own based on the sunny 16 rule. For asa100 film, you would be shooting at 1/125 at f/16. 2 seconds is 8 stops faster than 1/125, so the equivalent exposure would be f/256. 4 seconds would be f/512. That would be assuming you are getting the correct exposure at 2-4 seconds.

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Measure the diameter of the pin hole and divide it into the distance it is from the film.. The number given is the f/stop number. Expect it to be quite large... . Pure example, and made to keep it simple here - . Say the pin hole is 1 mm (millimeter) and there are 25 mm's per inch... OK, say the film is 6 inches away.. How many mm's in 6 inches..? = 150... In this case, the f/stop would be f/150...

Camera Guy

Here is one link that will help http://mrpinhole.com/calcpinh.php

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