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The LongTime Exposure Calculator is a lightweight app for the iPhone that automatically works out what shutter speed you should use when adding a neutral density filter over the lens.
When you're using standard ND filters such as NDx2 and NDx4 you may have never needed a calculator as you have a good grasp of shutter speed and aperture values. If you add a filter you can quickly compensate. But then along came the Lee Filters Big Stopper with it's 10 stop increase...and that's when things started to become complicated. It's easy to go two or three increments, but ten can be quite challenging. And that's where this wonderful little calculator comes in.
LongTime Exposure Calculator: PerformanceYou simply touch the screen and slide the left hand side filter type into the centre view position. Then on the right you slide the current shutter speed into view. Instantly you're given the calculated new shutter speed to set on your camera.
One thing that soon became apparent is that the shutter speed values are in full stop steps. This means if you're using a modern camera with half or even one third increments, the shutter speed you may have displayed in your viewfinder may not correlate to the display on the calculator so some jiggery pokery is needed.
Lee Filters Big Stopper.
LongTime Exposure Calculator prosMakes light work of long exposures
Easy to use
LongTime Exposure Calculator consOnly full stop shutter speeds
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The LongTime Exposure Calculator is available from the iTunes Store for free. For more information please visit the HPR-Solutions website.