ND-Filter Expert Logo

ND Filter Expert – Exposure Time Calculator

Master long-exposure photography with the smartest ND calculator on Android

Free & Pro  Β·  DSLR & Mirrorless  Β·  Stack up to 5 filters

ND-Filter Expert App screenshot Download Free on Google Play

Why Photographers Love It

Everything you need for perfect long-exposure shots β€” in your pocket.

Long Exposure During the Day

Instantly calculate the correct exposure time when using ND-Filters, even in bright conditions.

Built-in Bulb Timer

No more guesswork in Bulb mode. Tap start and the app counts down your perfect exposure time.

Stack Up to 5 Filters

Combine multiple ND-Filters and the app will calculate the combined exposure time instantly.

Live calculation in ND-Filter Expert App

Live Calculation in the Twinkling of an Eye

Enter the exposure time suggested by your camera along with the ND-Filter value you want to use. ND-Filter Expert immediately calculates the optimal exposure time β€” no guessing, no math.

Timer function in ND-Filter Expert App

Stress-free Photography with the Timer

In Bulb mode you can expose for more than 30 seconds β€” but counting 2 minutes 34 seconds in your head is no fun. Start the integrated timer when you release the shutter and relax.

Favourites in ND-Filter Expert App

Favourites Always at Your Fingertips

Save your most-used filter combinations as favourites for instant recall. The Pro version lets you sort, search, and filter your favourites however you like.

All Features at a Glance

The Lite version covers the essentials; Pro unlocks the full feature set for serious photographers.

Feature
Lite logo
Lite
Pro logo
Pro
Calculating Exposure Time βœ“ βœ“
Combination of ND Filters βœ“ βœ“
Timer Function βœ“ βœ“
Saving Favourites (up to 5) βœ“ βœ“
Tips & Tricks βœ“ βœ“
Save Combined Filters β€” βœ“
Search in Favourites β€” βœ“
Filtering & Sorting Favourites β€” βœ“
Table of All Available Filters β€” βœ“
Advanced Settings β€” βœ“

Online Calculator

Try the calculator right in your browser β€” no app needed for a quick calculation.

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