Hi All. I have just had Apple accept my first iPhone App into the store! It is a simple little app I originally made for my own use that I thought others might also get some value from.
It allows you to select from a list of available films and a metered exposure duration - from there it will calculate an actual exposure including reciprocity. The maths is based on as many formaulas I could find for some common films. You can currently select from Ilford B+W, Velvia (color filtered and unfiltered), Provia, Tri-X and Ektar. I will be more than happy to add new films if anyone has the mathematics and can send it to me.
The app also includes a slider to let you add or remove stops of initial exposure (for example if you add an ND) and gives you a count-down timer to time-out your shutter.
It's pretty simple - but I have found it really useful.These shots were made using it.
I have it listed at $1.99 - but will obviously review that depending on feedback and workload.
You can get it here.