metergeist

Meter. Track. Shoot.

A free light meter app and film roll tracker built for TLR and medium format photographers shooting 120 film.

Light Meter for Film Photography

Real-time exposure calculation
Aperture and shutter speed recommendations
Lock either setting independently
Exposure priority modes
Overexposure and low-light warnings
EV display

120 Film Roll Tracking

Load film onto specific cameras
Automatic frame counting for 120 film
Track each roll: shooting, complete, developed
Switch cameras — film stays with the right body
Add and edit notes per roll

TLR & Medium Format Cameras

11 camera profiles with real specs
Manage multiple cameras with nicknames
See film status per camera at a glance
Rolleiflex, Yashica, Mamiya, Minolta

Reference Photos

Capture with full exposure metadata
Frame-numbered, tied to your film roll
Text and voice notes per frame
Compare with developed film later

Focus Assistance

Focus peaking overlay
Adjustable sensitivity and color
Rule of thirds grid

19 Film Stocks

Tri-X, HP5, Delta 3200
Portra 400, Gold 200, Ektar 100
Cinestill 800T, Superia, and more

Built for Twin-Lens Reflex Photographers

metergeist includes camera profiles with real aperture and shutter speed constraints for the most popular TLR cameras. Load your specific camera, and the light meter recommends only settings your camera can actually use.

Supported Camera Profiles

Explore the TLR Camera Guide

New to twin-lens reflex cameras? Our TLR Camera Guide covers 48 cameras across four brands — complete with specs, history, current market prices, manuals, and sample photos.

Rolleiflex & Rolleicord Yashica TLR Cameras Mamiya TLR System Minolta Autocord