ND Filter Expert Pro

Calculate ND filter exposure times – precisely, quickly, in the field.

The complete ND filter calculator for photographers, drone pilots and
videographers. Seven specialized calculation modes for every shooting
scenario. Whether you stack filters for a seascape, fly a DJI drone, or
shoot long-exposure video – get the right exposure time in seconds.

7 CALCULATION MODES

– Simple: shutter speed + ND filter = new exposure time

– Expert: combine aperture, ISO and up to 5 filters at once

– Bulb: long exposures in hours, minutes, seconds

– Reverse ND: pick your target shutter speed, get the matching filter

– Light / EV: filter based on aperture and ISO

– Drone: frame-rate based calculation (180° shutter rule)

– Vario ND: calculations for variable ND filters

BUILT-IN EXPOSURE TIMER

Tap your result to start the timer. Runs as a background service, alerts
you with sound and vibration. No stopwatch needed.

FAVORITES & CUSTOM FILTERS

Save your go-to setups per calculation mode. Search, sort and filter for
instant access. Create custom ND values for your specific gear (Tiffen,
K&F, Lee, Haida, NiSi, PolarPro and more).

LEARN AS YOU SHOOT

Full tutorial, step-by-step guides, and a real-world FAQ with 11
practical questions. Accessory recommendations for tripods, step-up
rings and filter brands.

ALL FEATURES

– 7 specialized calculator modes

– Stack up to 5 ND filters

– Dedicated Drone Mode

– Built-in exposure timer

– Custom ND filter values

– Full tutorial and FAQ

– Night mode / dark theme

– Screen lock during exposure

– 27 languages

– Privacy first, no unnecessary permissions


Questions or feedback? support@nd-filter-expert.com