The most complete ND filter calculator for photographers, drone pilots & videographers – completely ad-free.

7 Calculation Modes – fully included, no limitations

ND Filter Expert Pro gives you every calculation mode without restrictions. No ads, no locked features – the complete tool, exactly when you need it.

– 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. Runs as a background service with alarm and vibration when done. Tones and vibration patterns fully configurable.

Unlimited Favorites & Custom Filters
Save, search, sort and organize setups per calculator mode – without limits. Create and manage custom ND filter values for your specific gear.

Learn as you shoot
Full tutorial, step-by-step guides, and an FAQ with 11 real-world questions on neutral density filters. Accessory recommendations included.

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

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