Tools Hub

Exposure

ND exposure calculator

Extend a metered shutter time for one or more neutral-density filters.

Open tool Exposure

Long exposure & reciprocity

Plan filter-adjusted exposures and apply film-maker data you provide.

Open tool Lens

Focal length & format converter

Compare framing across Micro Four Thirds, APS-C, full frame, medium and large format.

Open tool Focus

Depth of field & hyperfocal

Estimate near and far focus limits using a traditional circle-of-confusion calculation.

Open tool Sequence

Time-lapse planner

Estimate frame count, clip length, exposure clearance and storage.

Open tool Exposure

EV exposure converter

Convert EV100, ISO and aperture into a practical shutter setting.

Open tool Flash

Guide number calculator

Calculate a direct-flash aperture, working distance or guide number.

Open tool Darkroom

F-stop printing calculator

Adjust print exposures by fractional stops and create even test strips.

Open tool Darkroom

Darkroom process timer

Run a saved multi-step film or paper process with agitation reminders.

Open tool Darkroom

Developer dilution mixer

Calculate stock concentrate and water for a chosen working volume.

Open tool

Work out the numbers before you load the film. Exposure, format, focus and timing tools for the field. Calculations run in your browser; no account is needed. Save the hub to your Home Screen for quick access. Results are estimates – check film-maker guidance and camera tolerances for critical exposures.