As you may know, stars move. Rule of 600 app helps you set shutter speed in astrophotography by focal lenght, type of sensor and lens, respectively. It calculates maximum time using the rule of 600 that allows clear photograph (stars doesn't turn in egg-shape or trails).
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Version 1.0
New crop sensor factors, bug fixes.
Version 0.9
Calculator minor bug fixed.
Version 0.8
Calculate button has been removed, every action triggers calculation.
Settings are saved automatically and reloaded on application start.
Option to select camera manufacturer (used for crop sensor multiplier).
Version 0.5
Set your lens' focal lengths, type of camera sensor and type of lens.
9Apps 4.9
