500 RULE for Astropho­tog­ra­phy

Photo Plus - - The Apprentice -

As the Earth spins, stars be­come blurry or turn into trails if your ex­po­sure is too long. To cap­ture sharp stars, use the ‘500 Rule’. Di­vide 500 by your fo­cal length to get the long­est shut­ter speed. At 18mm, that’s 500/18 = 28 secs. The wider your lens, the longer your ex­po­sure can be, great for get­ting more light on your sen­sor! On Thomas’s ul­tra wide-an­gle full-frame EF 11-24mm f/4l USM lens he could shoot at 500/11 = 45 secs.

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