The rule of 600 for Astro photography
For those that like to take star pictures and are trying not to have star trails the rule of 600 is something that you need to know for this and your other Astro Photography.
The rule is as follows, you take the millimeters of the lens that you are shooting and divide it into 600, this gives you the maximum number of seconds that you can expose the shot for before you will see star trails.
One note: you need the 35mm equivalent lens size.
So how does it work?
Full Frame Sensors
On full frame cameras (cameras with full frame sensors) you would do the following:
Lens – 50mm
600/50 = 12 So you could shoot at a shutter speed up to 12 seconds before you will see lens movement.
APS Sized Sensors
On a camera that has an APS size sensor with a 1.4 conversion ratio you would do the following
Lens – 50mm
50 x 1.4 = 70
600/70 = 8.6 So you could shoot up to 8.6 seconds before you would see star trails
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