Durable Paper Pinhole Exposure Calculator

If you don't have (or use) a light meter, Richard Koolish's clever mechanical calculator can help you select an exposure time for tiny aperture (pinhole) cameras, which require lengthy exposure times.

These disks are designed around Ilford's version:
http://www.ilfordphoto.com/Webfiles/2011106152612113.pdf
Which is attributed to Mr. Koolish, but freely downloadable (and included in the source files for this thing).

...but there are others:
http://www.rahji.com/pdf/koolish.pdf

http://static.freewebstore.org/templates//79100/myimages/pinhole_camera_exposre_calculator.pdf

http://www.rahji.com/wordpress/2007/05/12/pinhole-exposure-times/

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