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Old 24-11-2008, 10:52 AM
DJDD
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DJDD is offline
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 936
Hi,

This is info given me by someone else on the forum, and is a rough guide.

Maximum exposure time before trailing is evident isL

t = 1000/FL (near the pole)
and
t = 700/FL

where
t = exposure time
FL = focal length of lens

of course, this is a rough guide.

also, see this thread for what is possible:
http://www.iceinspace.com.au/forum/s...ad.php?t=21306
with 50 x 10 second exposures

and my poor first attempt with 10 x 13 seconds for comparison:
http://www.iceinspace.com.au/forum/s...ad.php?t=23805
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