ZoneCalc vs mySpotMeter

ZONECALC · ZONE SYSTEM CALCULATOR ZoneCalc is a precision tool for large format, medium format and 35 mm photography following Ansel Adams' Zone System. Built for photographers who work with a spot meter, develop their own negatives, and want full control over exposure and tonal placement. METERING In Classic mode, enter the shutter speed for the deepest shadow with detail (Zone II) and the brightest highlight with detail (Zone VIII). ZoneCalc returns the shutter speed for Zone V, 18 % middle gray: the exposure you set on the camera. Multi mode accepts any number of measurement points across the scene. The app auto-assigns each point to a zone; drag pins on the zone strip to express your placement intent. For pinhole cameras, you can enter your own apertures beyond f/32. NEW: METERING WITH THE IPHONE CAMERA Capture the scene with the iPhone and tap up to five measuring points into the image. The reading is taken from the camera's RAW image, not from the displayed photo. ZoneCalc pre-assigns the darkest area to Zone II and the brightest to Zone VIII; every zone can be changed. One tap transfers the reading to the calculator: two points go to Classic, more points go to Multi. Zone spacing and dynamic range are reliable right away. For the absolute value, calibrate the iPhone once with a grey card against your spot meter. Camera readings are saved to the history with image and measuring points. Camera metering requires an iPhone that captures RAW. RECIPROCITY For exposures above one second, the Schwarzschild effect is corrected automatically: t_corr = t_nom ^ p, using the film-specific exponent. The corrected camera time appears directly in the result card. The shutter speed list extends to 30 minutes. Films with reciprocity data: Ilford HP5+, FP4+, Delta 100/400, Pan F+ 50, Ortho+ 80, Kodak Tri-X, T-Max 100/400, Kodak Portra 160/400/800, Fujifilm Acros 100 II, Fomapan 100/200/400, Leica Monopan. N-RATING & DEVELOPMENT ZoneCalc compares the scene's dynamic range against the film's usable latitude and proposes a development adjustment, from N−2 to N+2. For each film, concrete times are shown for common developers: D-76, Rodinal, HC-110, XTOL, ID-11 and T-Max Dev, with dilutions per Massive Dev Chart and manufacturer recommendations. Add your own tested times per film and developer. HISTORY & EXPORT Every calculation can be saved with a note and the chosen developer; two entries can be compared side by side. The complete result with shutter speed, reciprocity, N-rating and development times exports as an image for the darkroom or for sharing via AirDrop, message or mail. DESIGN The interface follows the visual language of classic Leica instruments: monospaced typography, warm amber accent, hard edges instead of rounded corners. Fully localized in English and German, all-dark throughout, optimized for darkroom and field use. ZONECALC PRO Classic two-point metering with Zone V calculation and the zone strip are free. The one-time Pro upgrade unlocks: • Metering with the iPhone camera and grey card calibration • Multi-point metering with interactive zone assignment • Reciprocity correction and N-rating • Development recommendations with times per developer, plus your own development times • Save, compare and image export One app, no subscriptions, no data collection. All calculations run locally on device, including camera metering. ZoneCalc uploads nothing.

Designed by a photographer, for photographers. Built with one clear goal: precise spot metering for photographers who want full control over exposure. mySpotMeter turns your iPhone into a dedicated spot meter with selectable 1°, 2° and 4° measuring angles. Whether you shoot film or digital, you can isolate specific areas, evaluate contrast and place your exposure with confidence. Key Features • Selectable 1°, 2° and 4° spot metering angles • Dedicated readings for shadows, highlights and middle gray • Aperture or shutter speed priority • Average readings mode • Store and compare measurements directly on the exposure scale • Clear EV difference between your target and the current reading • Instant aperture calculation based on the selected ISO and shutter speed • Shutter speed range from 240 seconds to 1/8000s • Aperture range from f/1.0 to f/128 • ISO range from 3 to 409.6K • Exposure settings in 1/3 or 1/2-stop increments • Measure using the on-screen control or the iPhone volume buttons • Automatic calibration and precise manual EV adjustment • Filter factor correction up to FF1000 Built for Deliberate Exposure Instead of averaging the entire scene, mySpotMeter lets you measure only the area that matters. Compare shadows and highlights, understand the available contrast and decide exactly where to place your exposure before pressing the shutter. Download the User Manual You can view or download the complete user manual before purchasing or downloading the app. Scroll to the Information section of this App Store page and tap Developer Website. About This app is built and maintained by an independent photographer and developer. It is a focused photographic tool, continuously refined through real-world use. If you have suggestions or need help, feel free to contact me: davidquiles@me.com