NDTimer

Really happy with this. Does what it says it does.

I'm sure it's obvious once it's explained, but I cannot find any use for the hold button. When pressed, it holds nor releases nothing. Other than that, it's an excellent app.

Fantastic app that allows me to focus on setting up my camera/filter, composition, etc -- instead of calculating exposure times manually. Contrary to the previous review I find the app to be very accurate regardless of what brand ND filter I use (Hoya or Lee) as it works off of stops not the particular brand type. Furthermore, you can easily adjust exposure in 1/2 stop increments by swiping the timer if you feel it is necessary either to compensate for your metering technique or for reciprocity failure when using film.

I have Lee ND filters and this app is not accurate for those filters.

I usually don't write a review. This app is great. Usually lee big stoppers come with a table. I had Hoya and did not have a timer table. This worked amazing. The only problem I had was it underexposed by one stop. So once the adjustment was made it was all fine. May be it was to do with my Metering technique.

Had the same issue as others and notified developer. Fast professional response. Did a little troubleshooting and determined that the timer would not stop ONLY if you failed to acknowledge the notification to "close your shutter" if phone went to sleep while it was timing. Provided this feedback and this issue was fixed with an update promised in a couple of days. So until then make sure you acknowledge that notification popup and all will be fine. Very happy with the app AND the response of the developer.

This app only works for ND64 and below. When using anything above an ND64 the math is all wrong and the exposure times are way under exposed.

This app is truly horrible and unusable in its current state. The timer started and just keeps ticking away, even after reaching the end time, it just starts counting negative. There is no stop or reset button and closing the app doesn't help. Maybe I am supposed to restart my phone? Save your 99 vents and buy something else.

The timer starts immediately and counts down too fast. There is no way to stop the timer and start over. Currently this app is useless :(

This very easy to use and saves time figuring the correct shutter speed when using ND filters in the field. It also helps if you have to stack them.