Stars and Landscape

[tgtaylor]

Star trailing is dependent upon the aperature of the lens and the declination of the star. For an 85mm lens, Norton's 2000.0 Star Atlas ans Reference Handbook gives the following exposure times (in seconds) at which star trailing becomes evident:

0 degrees: 6 seconds
40 degrees: 8 seconds
60 degrees: 12 seconds
80 degrees: 34 seconds

Thomas

I believe that I copied that wrong last night as I was listening to the Angels/Yankee game. Star trailing is dependant upon the focal length of the lens and the declination of the star. Although Norton's Handbook didn't specify, I suspect that the above focal length is that of a 35mm camera.

Also, I recall the handbook recommending stopping the lens down 1 stop from maximun aperature.