ND Filter Exposure Calculator
ND Filter Exposure
Calculate adjusted exposure settings when using neutral density filters for long exposure photography.
Formula
New Shutter Speed = Base Shutter Speed x 2^(ND stops); ND Factor = 2^(stops); Example: ND64 = 6 stops = 64x light reduction
Frequently Asked Questions
What ND filter should I buy first?
A 6-stop (ND64) is the most versatile choice. It allows long exposures in daylight for smooth water and cloud effects while still being usable in lower light.
Can I stack ND filters?
Yes, stacking filters adds their stop values together. A 3-stop and 6-stop stacked equals 9 stops. However, stacking can introduce vignetting and reduce image quality.
What is a 10-stop ND filter used for?
A 10-stop ND filter is used for extreme long exposures in bright daylight — turning a 1/125 second exposure into about 8 seconds, creating smooth water and streaked clouds.