KOCOMOTO

Worrying won’t stop bad things from happening. It only stops you from enjoying the good.

The ‘500 Rule’

Leave a comment

Astrophotography.

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).

the-500-rule_zpslqgvjdmu

 

This is just a guideline how long to exposure your shots before you get blurry shots due to the earth’s rotation. because sometimes we want star trails and sometimes we don’t.

For custom focal lengths, simply divide 500 by the focal length of your lens. Example, for a 20mm lens: 500 / 20 = 25 seconds on full frame, or 500 / (20*1.6) = 16 seconds on a Canon crop camera or 500 / (20*1.5) = 17 seconds on a Nikon/Sony crop camera.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s