March 15, 2019 ☼ photography ☼ art.and.photo

Reciprocity failure

I created a page which aims to provide:

• some information regarding reciprocity and reciprocity failure;
• a calculator for several famous film models: FujiFilm Fujichrome Velvia 50, Kodak Portra 160 and 400, Ilford FP4 Plus 125 and Ilford HP5 Plus 400; every calculation is based on a specific formulas - and mind that the latter is not only per film model, but also may change based on the exposure time;
• the SYNTAX of the used formulas - in both PHP and BASH format (the lattter is for people who prefer a good ol’ *nix instead of a webpage);
• the source of calculations (there are countless resources on internet, but I chose the ones which I found clear)

example


Enjoy !