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? support@nd-filter-expert.com

ND Filter Expert DSLR & Drone

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