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An iPhone/iPod touch application for photographers from hobbyist to pro.

NDTimer   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.
Following is a typical scenario when using neutral density filters to achieve long exposures:
  1. Set your camera to "Aperture Priority" mode Nikon(A) and Canon(AV) and disable autofocus .
  2. Compose your shot, manually focus and meter the scene through your camera's lens(TTL) without filter(s) installed and note the exposure time(shutter speed) displayed in your viewfinder or LCD if your camera is equipped with "Live View."
  3. Launch NDTimer and dial in the given exposure(shutter speed) and filter of your choice. NDTimer will calculate and display the correct shutter speed or exposure time necessary to properly expose your scene. If you are using a second filter in combination with your first filter (stacking), simply tap the "stack filter" button, choose the filter you have staked on top of your first filter and NDTimer will calculate the necessary compensation and adjust the exposure time accordingly.
  4. Switch your camera from "Aperture Priority" to "Manual" mode, install filter(s) onto your lens and either dial your camera's shutter dial to shutter speed displayed or set your camera to "bulb" mode and expose for the displayed time by simultaneously tapping "Start Timer" and opening your shutter with a remote trigger. The timer will countdown to zero and an alert tone will sound at the end of the exposure time. If your iPhone or iPod touch goes into sleep mode during your exposure, you will receive a "pop up" notification at the end of your exposure time
Note: Cover your eyepiece during long exposures to avoid light leak.
Features:
Resulting exposures of less than 30 seconds will be displayed as a shutter speed with which to set your camera to.
Resulting exposures of more than 30 seconds will be displayed as a timer with a "Start Timer" button.
Stack filter option allows you to adjust exposure time if "stacking" filters

Customer Reviews

Almost Perfect  ★ ★ ★ ★ ★
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.
 
Great app!  ★ ★ ★ ★
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!
 

If you've already downloaded NDTimer, we sincerely appreciate you!
If you haven't, we sincerely hope to appreciate you.

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