PolarPro app icon on Apple iPhone screen. A photo and video tool to calculate which ND filter for a desired shutter speed. App now discontinued Stock Photo - Alamy
ND-Filter Expert App - The Best ND-Calculator in the whole Universe
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ND Filter Calc (DSLR) for Android goes free as myAppFree app of the day
Long Exposure Calculator on the App Store
If you Shoot Long Exposures, You Gotta Get This App - Scott Kelby's Photoshop Insider
Free PolarPro app calculates ND filters and more! - WeTalkUAV.Com
neutral density - Sony A7* ND filter app - Photography Stack Exchange
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