Shutter-Speed-Tester for your iPhone
This sounds like a great app and sensor Idea. I'll check if I can find that fototransistor here and assemble one for your app. Thanks
Fototransistor-Plugs for sale
In my last posts I told you about the fototransistor-plug, which allows you to make real light-measurements with your iPhone.
I am know able to offer those plugs for sale, if you don't want (or don't know how) to built the plug yourself.
The price is $15,50 each. Shipping to USA is $4,50, so total $20 incl. shipping.
If you are interested, just send me a short email at: firstname.lastname@example.org :)