Long exposure trails?

You need to be at a wider focal length, as has been mentioned, if you don't what the trails to be as evident.
 
Pretty much with that lens you won't be getting any great star shots without trails. The zoom + largest f-stop being f4 is simply not a lens for astrophotography at all. It just doesn't have a large enough f-stop to gather the amount of light needed to show the stars before they show trails from movement.
 
It's entirely possible to take long exposure shots through a long lens without trails if you have a device to turn the camera opposite the Earth's rotation.

You can build a "barn door tracker" for under $20 (or more), but expect to spend a lot of time fiddling and practicing before you get any good results. But results can be had!
 
"No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced"

:spin1::spin1::spin1::thumbsup:
 
There's nothing wrong with f/4, I use that as part of a base exposure for night work. The key is getting the field of view wide enough. This is a 30 second exposure but because it's so wide, you really don't see the streaking. There is a tiny bit but you really have to look for it:

Lunar rainbow on Yosemite Falls
MG-3267-Edit-4.jpg
 
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There's nothing wrong with f/4, I use that as part of a base exposure for night work. The key is getting the field of view wide enough. This is a 30 second exposure but because it's so wide, you really don't see the streaking. There is a tiny bit but you really have to look for it:

Lunar rainbow on Yosemite Falls
MG-3267-Edit-4.jpg

Blue corn. this is just WAY GOOD! Do you have a web site with more of your work?
 
Did you manually set the focus on infinity before you took the last shot series??? it seems that the stars are way out of focus?
Also opening the shutter to 4 or even 2.8 shouldn't theoratically cause any issues due to the distance to your subject which gives you more DOF.
 
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