How Correct is the 500-Rule? - Experimental Astrophotography

Virtual Pathfinder video "How Correct is the 500-Rule?". Produced 1 December 2019. This video presents the results of a test of the "500-rule" for astrophotography without tracking. The rule tells the longest exposure time possible, without motion blur caused by Earth's rotation in the image, for a given focal length.

This test is evaluation of images shot at three focal lengths - for each focal length images of +/-20% shutter speed is compared side by side. The image size and cropping is taken into consideration when evaluating the results. It is. good to know how long exposure time is possible without tracking as a reference.

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