The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
FilterCompute takes the guesswork out of estimating exposures with neutral density filters.Given an exposure without a filter and a filter adjustment factor, this calculator will allow you to select an fStop, exposure time, and an ISO that will provide a correct exposure with the filter. The calculator completely eliminates the trial and error that can be involved with calculating a correct exposure for a filter that is too dark to take a correct through-camera exposure. This free version computes exposure increments in 1.0 fStop intervals, and requires an exposure taken by an external camera or a light meter.