Exposure Time Calculator

Run one test exposure, read your calculator, get the corrected time. Works with step-counting wedges (Stouffer, SAATI, Ryonet) and factor-readout filters (KIWO/Ulano ExpoCheck, Chromaline Dual, SAATI Exposure Calculator).

1 · Your exposure calculator

Type of calculator

Wedge

Target step (last fully-cured step you want)

7 solid steps is the standard convention (SAATI suggests 6 for CtS exposure units). Adjust to your emulsion.

2 · This round

Exposure time you just used (seconds)

What did the wedge show after washout?

Last fully-cured step

3 · Session log

No rounds logged yet. Each round you log fills in the next round's time automatically.

Rounds are stored in this browser only (localStorage). Clearing site data wipes them — export a backup if the session matters.