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.

Core features:
- Add your own custom filters
- Select one or multiple filters
- Built-in timer / alarm with optional vibration and sound
- Easy to use, simple layout

If you got any questions or suggestions for this app, just write an email at lite1993@gmail.com
I will answer ASAP. :)

For more information about neutral density filter:
http://en.wikipedia.org/wiki/Neutral_density_filter