f/oss vs Lume

f/oss is a free light meter for film photography, rebuilt from the ground up as a fully native app. Point the spot-metering circle at your subject and read the exposure instantly. f/oss measures true photometric luminance through your iPhone's camera and is calibrated against professional reference meters. FIVE METERING MODES • Aperture Priority: set f-stop and ISO, get your shutter speed • Shutter Priority: set shutter and ISO, get your f-stop • Exposure Value: read the scene's EV directly • Cine: shutter angle and frame rate for filmmakers • Manual: check your chosen settings against the metered scene BUILT FOR REAL CAMERAS • Camera profiles: save your bodies with their actual shutter and bias limits • Full, half or third stop increments • Configurable shutter, aperture, ISO and exposure bias ranges • Reference lock: freeze a reading and measure scene contrast in stops • Exposure lock for recompose workflows ACCURATE • True spot metering of exactly the circle you see • Full-color light analysis: reads saturated LED and neon light correctly • Verified against professional meters from daylight to low light FREE, NO SUBSCRIPTION Every feature is free, forever. If f/oss saves your shots, there is an optional tip jar.

Lume is a professional light meter for film photography and cinema. Point at the scene, lock the reading, then compose the shutter-aperture pair on click-stop wheels, the way a real meter works. PHOTO MODE • Reading at the centre of the frame, weighted like a TTL meter • Aperture or shutter priority, third-of-a-stop scales • Exposure compensation ±3 EV and ND filters up to ND1000 • 24 film stocks with reciprocity failure correction YOUR CAMERA • Set the shutter speeds and apertures your camera and lens actually have (e.g. 1/8–1/500, ƒ2.8–ƒ16) • The wheels stop there, and Lume never suggests a value you can't set • When the light asks for more than your camera can give, it tells you, and by how many stops FLASH • Work out the exposure for a shot with flash: guide number, the power the flash is set to (1/1, 1/2, 1/4…) and the distance • Flash and ambient light are added together, the way they add on film • On models with LiDAR the subject distance is measured at the centre of the frame CINE MODE • Frame rate and shutter angle • Aperture in tenths of a stop, as used on set LOGBOOK • Save every reading with a photo and the data burned in • Find your shots in a grid or on a map • Share, or save to your camera roll Metering uses the camera's real metadata together with pixel analysis, continuously calibrated against the sensor. Interface in English and Italian.