ISO 3 to 12800 range
Full ISO range from slow black-and-white to ultra-fast colour stocks.
Where to find it
Equipment tab Film Stocks, or Viewfinder ISO chip
Summary
Pick a film speed anywhere from ISO 3 (Pan F+ pulled, very slow stocks) up to ISO 12800 (pushed Delta 3200, T-Max P3200). Standard chips cover the common stops; you can also enter any custom value.
How it works
What it covers
Every commercially relevant film speed, from the slowest black-and-white emulsions at ISO 3 to pushed-stock combinations at ISO 12800. Standard chips line up with full-stop and third-stop values so the meter can speak in the same units as your camera.
Picking a value
Tap a standard chip to lock to a known stock value (25, 50, 100, 200, 400, 800, 1600, 3200). For pushed or pulled stock, type a custom value and the app remembers it for the current film entry.
Custom ISOs
Anything you type that is not on a standard chip is added to the customIsos list and stays available for later. Useful for stock you push consistently (e.g., HP5+ at 1600) or unusual film like Adox CMS 20.
How the meter uses it
The selected ISO drives every exposure calculation: aperture and shutter recommendations, the EV100 chip in the metering layer, the SBR-to-development advisor, and the reciprocity correction. Change ISO and the whole pipeline updates instantly.