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LongTime Exposure Calculator

By Thomas Penn

This app is only available on the App Store for iOS devices.


LongTime is a tool for photographer who uses neutral density filter (nd) for capturing long time exposures. Determine the exposure time without attached filter. Calculate the exposure time for your ND-filter with LongTime.

What's New in Version 1.2

bug fixing

iPhone Screenshot

iPhone Screenshot 1

Customer Reviews

Really good but missing the following

Really nice app easy to use and free it's exactly what i was looking for I seriously recommend it. However i didn't rate it five stars as its missing the following:
1. It only works with full stops, so its missing the 1/2 & 1/3 of a stop.
2. It only works by adding only 1 filter at a time, so its missing filter combinations like adding the CPL with the ND filters.

Works but needs updating

I just opened the app and a box came up saying the app may slow down my iPhone and that it needs updating. Hopefully Thomas is still supporting it?


Awesome tool for us photographers in the field! I used to carry a piece of paper with conversions written all over it for long exposures, but now it's on my phone

LongTime Exposure Calculator
View in iTunes
  • Free
  • Category: Photo & Video
  • Updated:
  • Version: 1.2
  • Size: 0.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 3.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

Current Version:
All Versions: