ND Filter Calc

Calculate the optimal exposure time for your photograph.
Simply specify the filters you want to use and the exposure time of the camera and ND filter calculates the optimum time span, for your photographs to become awesome!

Features:
– Add your own custom filters
– Select multiple filters
– Built-in timer / alarm
– Easy to use
For more information about gray filter / neutral density filter visit Wikipedia:
http://en.wikipedia.org/wiki/Neutral_density_filter