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thanks for the comments guys.
the exposure was about an hour at 3.5, i think. i did another one for 30 mintues of just sky and the trails are all there, just not as long. so i suppose aperture affects the brightness of the stars and shutter speed affects the length of the trail.
jimbot. had a look at yours, the foreground light is a nice effect, something i want to try in future. i had thought of pasting in a shot of the mountain for this one, but decided to leave it just as it is.
the exposure was about an hour at 3.5, i think. i did another one for 30 mintues of just sky and the trails are all there, just not as long. so i suppose aperture affects the brightness of the stars and shutter speed affects the length of the trail.
jimbot. had a look at yours, the foreground light is a nice effect, something i want to try in future. i had thought of pasting in a shot of the mountain for this one, but decided to leave it just as it is.

Just had a thought might help: 360 deg. in 24 hours (one earth rotation), so 15 degrees per hour, or one degree per 4 minutes.
Now I haven't got a protractor handy, but if anyone has, measure the circular angle of one of the longer trails, and then calculate. For instance, if, as it looks to me as a guess, it's about 15 degrees, then it's an hour exposure (which looking back is what Michael said.
Hope that's helpful
Nearly forgot to say - lovely shot , love the different star colours
Stephen
Now I haven't got a protractor handy, but if anyone has, measure the circular angle of one of the longer trails, and then calculate. For instance, if, as it looks to me as a guess, it's about 15 degrees, then it's an hour exposure (which looking back is what Michael said.
Hope that's helpful
Nearly forgot to say - lovely shot , love the different star colours
Stephen