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The resulting time will generally be very long, so you will have to adjust for reciprocity failure; unfortunately, different films require different adjustments, so you will have to determine the proper formula from the tech sheets for the film you are using. A rule of thumb for most black-and-white films is as follows:

Normal light meters do not, of course, work with abnormal cameras, but a relatively simple calculation will permit you to meter for a larger f/stop and convert the time given to one suitable for your pinhole camera. If you:

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Calculating exposures for your pinhole camera can be difficult. The Lensless Camera Mfg. Co., whose models we sell, has provided us with the following table of apertures and f-stops for their products. Please note that the format (4x5, 5x7, etc.) of the camera is irrelevant; only the working aperture and focal length determine the f-stop.