>>3688128If you halve the time the trail will be half as long and so on.
In the middle of your frame the trails are about 10pixels in diagonal.
If you go for an under 10s exposure your trails won't be as bad at about at 3pixels length
Ideally you can aim at under 5s and get much shorter 1,5pixles elongated stars not really much of a trail anymore.
You will obviously have to bump the iso quite a bit.
Look for a compromise between shortest time possible and image quality of higher a iso setting.
Also longer focal length means longer trails so stick to wide angles if your camera doesn't have good high iso performance.
