# ProFilm Meter > ProFilm Meter (iPhone/iPad app by Scott Henderson.) - Source: https://appshunter.io/ios/app/profilm-meter/id6761498714 (this page in markdown: same URL + `.md`) - Developer: [Scott Henderson](https://appshunter.io/developer/1889935226) - Category: Photo & Video, Productivity - Price: $14.99 - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 57 MB - Languages: American English - Released: 2026-05-20 - Data updated: 2026-09-15 - User reviews in markdown: https://appshunter.io/ios/app/profilm-meter/id6761498714/reviews.md ## What is ProFilm Meter? ProFilm Meter is the most complete light meter and exposure toolkit for film photographers. From 35mm to 8×10 large format, dry plates to tintypes, it handles every calculation you'd normally reach for three separate tools to solve — all offline, all in real time. LIGHT METERING Your phone's camera becomes a precision reflected-light meter. Choose spot, center-weighted, or average metering and dial in exposure with ⅓-stop, full-stop, or any combination of increment sets running simultaneously. A live RGB histogram keeps highlight and shadow zones in view at all times. Native per-frame ISO, shutter, and aperture capture at ~10 fps Multi-point metering: average 2–4 scene readings into one exposure value Tap-to-focus and multi-lens camera selection Adaptive EV smoothing adjusts for scene changes automatically Screen stays awake during active metering sessions CALIBRATION Two-point guided calibration locks each camera to a trusted reference. After calibration, a fine-tune step lets you match any external meter in ⅓-stop increments. Uncalibrated cameras are gated with a full-screen prompt so you never shoot on an unmeasured body. FILM STOCKS & RECIPROCITY An on-device film stock library covers 35mm, 120, and large format emulsions — including the full Zebra Dry Plate collection. Every stock carries its own reciprocity profile. Eight built-in profiles (Acros II, T-Max, HP5+, Portra, Fomapan, Zebra, and more) plus full custom profile creation, including Schwarzschild p-factor and optional threshold. Add custom film formats and reciprocity profiles inline, without leaving the film stock screen. COMPENSATIONS Reciprocity failure — corrected automatically for exposures beyond threshold Bellows compensation — calculated stop-for-stop from draw and focal length RA4 Color Reversal — estimates scene color temperature and gives you Mired-shift filter corrections for color positives; works in both ambient and flash mode Spectral sensitivity — metering coefficients adjusted for panchromatic, orthochromatic, and blue-sensitive emulsions Lens filters — ND (1–10 stops), polarizer, yellow/orange/red/green contrast filters, R72 and deep IR, plus custom filters Positive/reversal process — +0.5 stop compensation, auto-enabled for tintype stocks UV/environmental compensation — adjustable for altitude and atmospheric conditions IR Light Estimator — dedicated tool for infrared exposure estimation FLASH Flash metering detects incident flash via fast polling with peak-hold and sticky arming. A built-in flash trigger supports Optical Slave (fires the LED torch to trip slaved units) and Cable Sync (audio click for USB-C to PC-sync adapters). VIEWFINDER A lens-independent viewfinder zoom gives consistent framing regardless of which physical lens the phone uses. Overlay your chosen film format frame lines and compose like you're looking through a director's viewfinder. FIELD JOURNAL Save any exposure to the journal with one tap. Each entry records ISO, aperture, shutter speed, EV, reciprocity correction, RA4 and spectral corrections, GPS coordinates, and a cropped preview photo. Entries are exportable and shareable. EXTRA TOOLS Depth of Field Calculator — for any format and focal length Zebra Exposure Guide — zone-system reference for dry plate work Alternative Processes Meter — cyanotype, platinum, salt print, and more Step Wedge Tool — exposure planning for contact printing Rolling Shutter Calculator — flash sync safety for focal-plane shutters 20 FILM FORMATS 35mm · 6×4.5 · 6×6 · 6×7 · 6×9 · 4×5 · 5×7 · 8×10 · 9×12cm · 10×10 · 10×12 · 11×14 · 12×12 · 13×18cm · 20×24 · Sixth Plate · Quarter Plate · Half Plate · Whole Plate · custom dimensions 7 LANGUAGES English · Slovenian · Spanish · French · German · Japanese · Simplified Chinese PRIVACY All metering and calculation runs entirely on-device. No account required. No data leaves your phone. ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/profilm-meter/id6761498714/reviews.md ### 5/5 — Feasibly the best meter on my phone. *2026-09-01* After testing the beta version I decided to purchase this app. Its readings match my $400 light meter so it is something I can rely upon if the light meter is not available. There is a plethora of other useful tools in the app, which you might use or not, depending on the type of photography you practice (large format, medium format, 35mm, digital etc.)despite the enormous number of options the app offers, the layout on the screen is easy to navigate and the learning curve to use this metering app is not too steep. Highly recommended. Five stars. Bravo ! ## Version history (last 5 releases) ### 4.16.1 — 2026-09-04 Bug Fix for Journal saving ### 4.16.0 — 2026-08-19 Update to the RA4 reversal module and general spectral color adjustments ### 4:15:1 — 2026-08-17 Same as the last but fixed a toggle that wasn't functioning and updated P factors for the onboard filmstocks ### 4:15:0 — 2026-08-13 Added Ansel Adams style Zone system metering, UV lens compensations, auto save journal entries to your phone, ability to modify some button locations on the metering screen and some general improvements :) ### 4:14:58 — 2026-07-01 Flash updates, File growth bug solution, Update to GN tool and updated user manual --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-15.*