Manual Flash Calculator app for iPhone and iPad

Manual Flash Calculator provides a handy utility for determining subject distance when using photographic flash manually. Its quick and easy to use for tricky lighting situations where TTL auto-flash can often struggle.

This app requires no special permissions and is completely ad-free!

Key Features:
• Aperture range F/1.2 to F/22
• ISO range ISO50 to ISO6400
• Flash output from 1/1 to 1/256th power
• Flash exposure compensation to +/- 5.0 EV
• Zoom head support from 14mm - 200mm
• Settings are selectable in 1/3 stop intervals

Set the respective guide numbers for your flash at each zoom position. Refer to the guide number table in your flash user manual for details.