Long Exposure Toolkit
iPhone app for DSLR photographers
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ND Calculator

A sophisticated and flexible Neutral Density Calculator for Long Exposure photography. Our simple guided process will help you make impressive artistic Long Exposure photos at any time of day, without the guesswork. Its fun, and its easy!

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and lots more!

The app’s other great tools include a Timelapse Calculator, a Light Meter, Stops & EV Calculators, Moon Size & Star Trail Calculators, a Timer, a Torch, a live feed of Long Exposure photos from Flickr, and a library of over 50 hints and tips!