Zero Image Pinhole Exposure Calculator. Personally i much prefer to to use a chart. Take a light reading rotate the disc to the light reading at the light meters aperture and then read off the correct exposure next to the f 138 scale.
Web page was built on august 15 1999 last updated september 28 2003 all web content copyrighted 1999 2003 zero image co. Take a light reading rotate the disc to the light reading at the light meters aperture and then read off the correct exposure next to the f 138 scale. Enter the actual pinhole diameter and press calculate for the fstop 4.
Determining exposure times for pinhole cameras.
To calculate the exposure time for pinhole camera we first of all need to know the f number of the pinhole camera unlike normal cameras this value does not change because the hole remains the same size which therefore simplifies the final calculation. Check that the coverage circle is large enough to cover the negative 3. This video is about how to use the zero image pinhole exposure calculator. There are other ways to gage exposure i like this one.