FocalCalc
FocalCalc shows, live, what focal length your iPhone camera's current view corresponds to on full-frame, APS-C, Micro Four Thirds, medium-format and other cameras. Photos you take are saved with the equivalent focal lengths in their caption.
- Live equivalent focal length and angle of view (main format plus up to four more)
- Zoom slider with focal-length ticks
- Preset and custom sensor sizes
- Equivalent values recorded in each photo (EXIF and caption), with optional text burn-in
The app is available in English and Japanese.