Quote:
Originally Posted by Weebl
17mm F4.5 68 secs and ISO of 800
PP on a desktop helps, the laptop I use is a XP ( I use it for internet only) the longest I used was ~80 secs but by then the moon was up and I got poop.
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Your results are certainly good enough that you don't need my advice anymore, but I think you could get away with higher ISOs to shorten the exposure and reduce trailing. While you'll certainly have noise at ISO 1600-3200 it can clean up pretty well in post, while star trails are harder to get rid of.
Another thing you can play with if you just have a sky image with no ground background is stacking a bunch of relatively short high ISO exposures to reduce noise. Each shot will rotate a bit from the previous one just like a star trail, but the individual shots can be free from trails. For instance, you could go to a very high ISO like 6400 and shoot 16 shots in a row each for 10-15 seconds. A stacking program will overlay the exposures and take out the interframe rotation (and, hopefully, much of the noise).