myLightMeter PRO vs Stopwise

Designed by a photographer, for photographers. Built for reliable, precise exposure measurement across film and digital workflows. myLightMeter PRO gives you full control over exposure through a clean, professional set of tools. Key Features • Incident and reflected-light metering • Classic and Pro interface styles • Full manual control over aperture, shutter speed, ISO, and exposure compensation in 1/3- or 1/2-stop increments • Exposure range from 4 hours in Long Exposure mode to 1/8000 s, f/1.0 to f/512, and ISO 0.8 to 409,600 • Aperture-priority (Av) and shutter-priority (Tv) modes • Automatic ISO adjustment or ISO lock • Reciprocity correction for long film exposures • Sensitivity down to −2.5 EV, ideal for low-light scenes • Average multiple readings • Import shutter speed, aperture, and ISO from photos in your library • Organize readings into Sessions with photos, exposure data, camera and lens details, and notes • Keep your Sessions synced through iCloud, so they remain available when you switch phones or use another device • Export Sessions as PDFs or print them Advanced Tools • Hyperfocal-distance calculator • Five configurable presets, each storing camera, lens, ISO, filter, and film settings • EV display with an analog scale or numerical reading • mySPOTMETER and f/Tools integration About This app is built and maintained by an independent photographer and developer. It is the tool I personally use and continuously refine. If you have suggestions or need support, contact me at: davidquiles@me.com

Stopwise is not a light meter — it is an exposure calculator. It does not use your camera or any light sensor. You enter what you already know — an EV value, or an existing aperture / shutter / ISO combination — and it works out the equivalent settings. Because it only does the maths, the result never depends on your lens, sensor or OS version. Fully offline, no network needed. ■ How it works Three dials: aperture, shutter, ISO. Each row has a lock on the right. ・One locked — turn either open dial and the other compensates. The EV stays the same. This is equivalent-exposure conversion. ・Two locked — only one dial is left; turning it changes the EV. Use this to derive EV from a known combination. ■ Accurate by design Labels like f/11 and 1/125 are photographic conventions, not exact values — f/11 is really 11.3137, and 1/125 is really 1/128. Stopwise always calculates with exact powers of two and only rounds for display. That makes it more precise than mental arithmetic or a printed table. ■ Free version ・Aperture f1.4 – f22 ・Shutter 120" – 1/4000 ・ISO 100 – 1000 ・1/3-stop increments ・The complete conversion engine and locking behaviour The maths is identical in both versions. The free version is not crippled. ■ Pro (one-time purchase) ・Aperture extended to f0.8 – f56 ・Shutter extended to 300" – 1/8000 ・ISO extended to 32 – 102400 ・Switch between 1/2 and 1/3 stops ・12 built-in scenes — pick one to set the EV directly ・Save up to 20 of your own scenes No subscription, no ads, no data collection. ■ Privacy Stopwise collects, stores and transmits nothing. No accounts, no analytics, no ad SDKs, and no permission requests at all.