Pinhole Designer is a free download for Windoze (it even seems to run OK on Win7x64) that can do a bunch of calculations for pinhole size, angle of view and all that exciting stuff. It also has the ability to generate a chart, which can even be exported as an Excel file, the chart has two columns with exposure calculations. The left column is the metered shutter speed for f/22, the right column gives the exposure for whatever f-stop you've entered. It has the additional ability to generate the second column with compensation for reciprocity failure. It has built-in data for a number of films. Unfortunately it doesn't have all films, and hasn't been updated in seven or eight years.
Originally Posted by pinhole_dreamer
When I was playing with the Arista ULTRA 100, I picked Fomapan 100 as a choice (which I think is actually what it is). As an example, in the dull lighting at hand last weekend, the reading was 1/15 sec @ f/22. The uncompensated reading for an exposure at the f/210 of my pinhole would be 6 seconds. The compensated number was 44 seconds! That's almost three stops additional. A few years back, I used a similar chart with Delta 100 and got the impression the compensation for that film was a bit overdone, but that area seems to be a bit mysterious anyway!
My general sense is with pinhole it's better to err on the side of over exposure -- easier to have to draw out the print making exposure than have no shadow detail on the negative.
Last edited by DWThomas; 04-20-2011 at 10:05 AM. Click to view previous post history.