ND Filter Expert DSLR & Drone

Eve&Else

Contains adsIn-app purchases

About this app

Calculate exposure times for ND filters – precisely, quickly, and directly in the field.

The most complete ND filter calculator for photographers, drone pilots & videographers

ND Filter Expert gives you 7 specialized calculation modes for every shooting scenario. Whether you're stacking filters, flying a drone, or shooting long-exposure video – get your correct exposure time in seconds.

7 Calculation Modes
– Simple: Quick calculator – base shutter speed + ND filter = new exposure time
– Expert: Combine aperture, ISO and up to 5 filters simultaneously
– Bulb Mode: Enter long exposures in hours, minutes and seconds
– Reverse ND: Set your desired shutter speed and find the right filter
– Light / EV: Calculate the required filter based on aperture and ISO
– Drone Mode: Frame-rate based calculations for drone pilots (180° rule)
– Vario ND: Calculations for variable / adjustable ND filters

Built-in Exposure Timer
Tap your result to start the exposure timer directly in the app – no stopwatch needed. The timer runs as a background service and notifies you with alarm and vibration when done. Tones and vibration patterns are fully configurable.

Favorites & Custom Filters
Save your most-used setups as favorites per calculator mode. Search, sort and filter them for instant access in the field. Create and manage custom ND filter values for your specific gear.

Learn as you shoot
New to ND filters? ND Filter Expert includes a full tutorial, step-by-step guides, and an FAQ with 11 real-world questions. Plus accessory recommendations for tripods, step-up rings and filter brands.

All features at a glance
– 7 specialized calculator modes
– Stack up to 5 ND filters simultaneously
– Dedicated Drone Mode with FPS-based calculation
– Built-in exposure timer with background service
– Create custom ND filter values
– Full tutorial, step-by-step guides and FAQ
– Night mode / dark theme
– Screen lock during exposure
– 27 languages supported
– No unnecessary permissions – privacy first

Go Premium – ad-free & fully unlocked
Upgrade within the app: remove ads, get unlimited favorites and full access to all calculation modes and features. Or choose "ND Filter Expert Pro" as a standalone paid app.

Note: The free version contains unobtrusive banner ads outside the main calculator. All premium features can be unlocked via in-app purchase.

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 7.1.9:
- Fixed crash in tutorials
- Dependency updates
- Minor bug fixes