Developer Box for Film vs Silverlog Flash

This app contains various tools and counters that are useful when developing black and white film. It can be used with most film developer tanks, some adjustments have made to make it fit with the Lab-box from ars-imago. Neither this tool nor the creator of it are affiliated with ars-imago or the Lab-box in anyway.

Silverlog Flash calculates flash exposure using guide numbers — the fundamental relationship between flash power, distance and aperture. HOW IT WORKS Choose what to solve for and enter the other two values. Find the aperture for a given flash-to-subject distance, the maximum distance for a given aperture, or the guide number from a known distance and aperture. Adjust ISO to see how sensitivity affects your working range. FEATURES • Guide number to aperture calculation • Guide number to maximum distance calculation • Guide number from distance and aperture • ISO adjustment • Metric and imperial distance units • Works offline — no internet connection needed • Clean, focused interface • Dark mode support USEFUL FOR • Manual flash photography without TTL • Working out flash-to-subject distance for off-camera flash • Understanding your flash's effective range at different apertures • Film photographers using manual flash units Part of the Silverlog photography toolkit. No account required. No data collected.