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NDTimer is an iPhone and iPod touch application useful for calculating and timing correct exposures when using Neutral Density(ND) filters, particularly for long exposures with a filter of 6+ stops. NDTimer also provides a “stack filter” option allowing users who are stacking a second filter (including a polarizer) on top of their first, to calculate exposure times accordingly.
Note: Cover your eyepiece during long exposures to avoid light leak.
I finally found this app! ★★★★
by rejuvesite – Version 1.2 – Sep 12, 2013
This app works exactly as I had hoped. Take a shot without your ND and note the shutter speed your camera’s meter calculates. Then enter that speed into this app and boom, you’ve got your shutter speed when using the ND.
Useful app! ★★★★★
by Truebritgal – Version 1.2 – Feb 13, 2012
This app has proven very useful to me when taking long exposure shots. Easy to use, and saves me from having to spend time calculating exposure times!
This One Works Well ★★★★
by ShutterBob – Version 1.2 – Sep 10, 2011
Used this just this morning and it worked flawlessly. I was doing long exposures so a few seconds one way or the other didn’t matter, but I was happy to have this app so I wouldn’t have to embarrass myself by doing math on the iPhone calculator.
Great app! ★★★★
by 01f4irider – Version 1.2 – Feb 10, 2011
I really like this app, especially the feature that allows you to get exposure times for stacked filters. Very cool. The only reason I gave the app 4 stars instead of five is because you are only given a countdown timer for exposures over 30 seconds. And, if this is to be the ND app to end all ND apps then the countdown timer is going to have to go all the way down to at least 1 second (like NDCalc does, an app which I also own). Add that in the next update and I’d be an extremely happy camper. Overall, an excellent app. Thanks guys!
Almost Perfect ★★★★★
by MB1742 – Version 1.2 – Dec 22, 2010
Great alternative to doing the math in my head. Works as advertised. Has a nice UI, lets me stack my polarizer, and the countdown timer for exposures over 30 seconds is a nice touch. Wish it had a bulb mode where custom shutter speeds could be entered to be more useful with night photography.