Camera Calculations App – Download on the App Store

My fourth photography app, Camera Calculations, is now available on the App Store!

Camera Calculations icon - small

I’m fascinated by long exposure photography – day and night, but there’s usually some math involved. But it can be a pain to do calculations, especially when it’s cold and dark, and you’re worried about your gear and getting the shot.

It’s easy to make mistakes in the calculations, even if the formula you’re using isn’t too hard. But you have to remember each formula, and also how to take into account crop sensor factor (and what the factor is!) if you’re not shooting full frame.

And the formula for calculating f-stop difference when using Neutral Density filters isn’t exactly easy to remember.

This app is really four apps in one.

You can use the Timer for setting long exposures (up to 900 seconds, or 15 minutes). Start, stop, reset. Easy.

Timer Screen Shot - iPhone 8 Plus

The Shutter Speed Calculator for f-stop difference compensation, like when you’re using a Neutral Density filter to take long exposures – day or night. Just put in the starting Shutter Speed and the f-stop difference, and the app calculates your adjusted shutter speed.

Shutter Speed Calculator Screen Shot - iPhone 8 Plus

The Camera Shake Calculator is handy for knowing the recommended slowest shutter speed when shooting handheld, and you want to avoid blurry photos.

Camera Shake Screen Shot - iPhone 8 Plus

The 500 Rule Calculator helps you get the star photos you want. To do this, knowing how to calculate exposure times using the 500 Rule is essential, because you either want star trails in your shot, or be able to keep the stars sharp, with no trails.

500 Rule Calculator Screen Shot - iPhone 8 Plus

For Camera Shake and 500 Rule Calculator, the app takes into account whether or not you’re shooting full frame, general APS-C (1.5 crop factor), or Canon APS-C (1.6 crop factor), and standard focal lengths. The Camera Shake Calculator and 500 Rule Calculator give the exposure time in seconds.

These 2 calculators are easy to use and have 2 input factors needed from the user – focal length and crop factor.

Then if you’d like, switch to the timer screen and set the calculated time if you’d like to countdown, or you can use the timer screen if setting really long exposures. This timer counts down in seconds from 900 seconds (15 minutes), or any time between 0 and 15 minutes.

If you’ve ever been out taking photographs and set a long exposure, and wondered how much time you have left until the exposure will end, this is for you.

For example, if you’ve setup your camera and tripod and figured the correct shutter speed, but need to compensate for increased shutter speed due to Neutral Density filters or other changes, you may have struggled to keep track of the exact time before hitting the shutter release or remote button again. Or you may be standing in the dark, freezing, and wondering what exact exposure time to set, and once it’s set, how much time is remaining.

Download on the App Store by going to iTunes and searching for Camera Calculations, or click the link below. Hopefully one day I’ll develop a version to run on Android devices.

If you get it, please let me know what you think, and send suggestions for other apps!