LFTools vs Stopwise

LFTools is an app for Large Format and Film Photographers. In version 1.5.0 LFTools contains 2 Tabs. The first one is the 'LF Tools' tab, with several sub sections. Each section has a tool to calculate certain properties which are used in large format photography. Like extended exposure times with regard to bellows extension or the magnification from a bellows draw for a given focal length. The second tab, 'Film Reciprocity', contains the Film Reciprocity Calculator. This calculator is of interest for all film photographers who are interested in long time exposure. With the Film Reciprocity Calculator one can overcome the so called reciprocity failure, which is inherent to almost all films. It is quite simple to use, one just has to select a film, shutter speed and aperture an the tool automatically creates a table with extended exposure times. The app comes with a pre-populated list of films from Ilford. Ilford was the only manufacture who publishes the p factor for their films. Al be it, the user can add its own films for calculation.

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.