Into The Night Photography: My ‘450’ Rule to Stop Star Trailing Posted by imus on June 3, 2013 Posted in: Astronomy, Photography. Tagged: astrophotography, photography. so for my 16mm would be 450 / 16 = 28 seconds ??? Into The Night Photography: My '450' Rule to Stop Star Trailing. Posts navigation ← Brooklyn Brewery Retires Monster Ale | Beer Street Journal Blog | Photosmith, version 3 is out →