Simple, accurate, free – Lux - Professional Light Meter for Film Photography Review

Incredibly easy to use and always accurate. I’ve used this app extensively with my Hasselblad 500 C/M and it has never failed to give me perfect exposures. I’ve compared it to handheld light meters to ensure that my exposure is set correctly and it is always the same. If you’re used to older Sekonic light meters, there are other apps that mimic that interface well but are more frustrating to use. You just point your phone camera at your scene or subject, adjust your aperture, and the app will give you the correct shutter speed to use. Try it out.
Review by heylepe on Lux - Professional Light Meter for Film Photography.