PinholeCalculator is the essential toolbox to create, organize and use all your pinhole.
Calculate optimum operture parameter on the creation of the pinhole.
Backup on your smartphone all your pinhole with parameters previously calculated, with picture and drescription.
Calculate the speed according to the aperture of your pinhole and the brightness, with the calulation of reciprocity for the most current paper.
-light mesuring work with some devices, use a light cell or a camera to know the exposure.