For the near infrared camera mod with a Canon A495 camera, I wanted to record the size of the infrared-block filter that ships in the camera, so we can accurately cut replacement IR-pass filters.
The measurements are:
5/16 in x 3/8 in
Guido Stein was talking about mass-producing these with a paper cutter or something. Good idea, i'm tired of cutting them by hand...
Luckily there's some margin for error; the outer millimeter or so is covered by the rubber gasket anyways (see above).