ND Filter Calculator & Drone

Eve&Else

Contains adsIn-app purchases

About this app

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

GO PREMIUM

Remove ads, unlock unlimited favorites and get full access to every
mode. Or download "ND Filter Expert Pro" as a standalone paid app.

Questions or feedback? [e-mail]

Ratings and reviews

So far so good. Initially I d/l the free version but have now upgraded to the pro version. I have been using a different app before but the extra functions and features, such a having favourites and calculations for stacking filters and the useful tutorials makes this a good buy. There are reviews that talk about the timer stopping when the app is in the background, this no longer happens so ignore those older reviews

Just downloaded the app. Looks good and easy to use. A good improvement would be to retain the last settings instead of going back to the default if you want to try a different filter or speed. Now updated, and keeps the last settings to adjust for the next shot 🙂. Now 5 star rating 🙂

Best free ND app I've used. Ive tried several. Easy to use and straight forward. Easy to add / remove filters for when stacking. Wish it had the option to show the time in total seconds, instead of minutes and seconds so it would align to the bulb mode.

What’s new

Version 7.2.1:
- minor bugfixes
- Dependency updates