Sometimes we want star trails and sometimes we don’t.  What’s the longest exposure you can use before you start to get a star trail?  That depends on your sensor size and the focal length of your lens!  This handy chart gives you the answer using the generally accepted ‘500 rule’.  500/(your focal length in 35mm terms).

For a more in-depth discussion on this topic, please read this article HERE.

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REP005

The-500-rule

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