Silverlog Reciprocity vs Darkcloth

Silverlog Reciprocity calculates corrected exposure times for long exposures on film, compensating for reciprocity failure — the point where film loses sensitivity during extended exposures. HOW IT WORKS Select your film stock from a comprehensive database covering Kodak, Ilford, Fujifilm, Fomapan, CineStill, Lomography and more. Enter your metered exposure time and instantly see the compensated time you should actually use. Calculations use manufacturer-published reciprocity data or established empirical formulas, and each correction shows which method was used: interpolation from a published data table, or a Schwarzschild exponent formula. FEATURES • Over 70 film stocks with reciprocity data • Instant calculation — no submit buttons, results update live • Method shown with each correction — data table or Schwarzschild exponent • Built-in countdown timer for the corrected exposure • Favourite and recent films for quick access • Works offline — no internet connection needed • Clean, focused interface designed for use in the field • Dark mode support BUILT FOR PHOTOGRAPHERS Whether you're shooting Velvia at sunset, Tri-X under moonlight, or Delta 3200 in a cathedral, Silverlog Reciprocity gives you the corrected time without fumbling with charts or guesswork. Part of the Silverlog photography toolkit. No account required. No data collected.

"A good photograph is knowing where to stand." — Ansel Adams Darkcloth is a field viewfinder for technical and view cameras. Use the phone camera to preview the frame before you set up the camera. Choose a film format and focal length, add rise, fall or shift, compare lenses, and check level. It is meant for planning the photograph, not replacing the ground glass. Included tools: • Framelines for 6×7, 4×5, 8×10 and custom formats • Multiple focal lengths at once for lens comparison • Rise/fall and shift preview over the live scene • Reflected-light meter with average and spot readings • Reciprocity correction for common film stocks, plus custom stocks • Roll and pitch level • Scheimpflug tilt visualiser with near/far depth-of-field readout Darkcloth was made alongside the Fysh FTC-1, but it is not locked to that camera. It works with other technical-camera and view-camera workflows. No account is required. No photos are uploaded.