Long Exposure Calculator (Camera:How to do star trail photography.‪)‬ 4+

Masami Koya

    • 1.0 • 1 Rating
    • $5.99



1:This application is a long time exposure calculator which is useful for both beginners and professionals.
2:Learn how to do simple long exposure, like star trail photography.
(Preparation / Focus / Long Time Exposure)

If it is short-time (1 to 30 seconds) exposure, it is not necessary to calculate. Because,the optimal exposure is acquired by the photograph is taken several times.

On the other hand,stellar orbital photography,night photography,etc. have the necessity of taking a photograph for 30 minutes or more when you take a photo of long time exposure.

This application can calculate the required exposure time by inputting a standard value (F-value,ISO-value, and the number of seconds), and a preset value (F-value,ISO-value).

Like I said before, this application was made for the practical function of long time exposure photography that everyone can use if they have the right equipment.

Please take advantage of this application and enjoy great a long time exposure photography.

F-value bug fix.

■World Review

Great! ⋆⋆⋆⋆⋆
Very useful application! I only miss a timer and the time with a nd-filter but hey, it's free and great made!

great ⋆⋆⋆⋆⋆
and usefull app ! very simple to calculate the needed exposure time .

What’s New

Version 1.3

This app has been updated by Apple to display the Apple Watch app icon.

Layout Fix.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

DisdainFLL ,

Waste of cash

Avoid this pathetic app. It provides minimal help. It is worth around 15cents. Pointless.

Maxfx68 ,


Well this app should cost no more than 99c.
The interface is plain and basic.
It doesn't even have any look to it.

Yes it is a rip off.

Scotty Finners ,

Does not work

Cannot select a different f stop value than 1.4. It doesn't even calculate. Don't buy it. I want my money back.

App Privacy

The developer, Masami Koya, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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