This is a photo of Venus over the treeline on my property. I zoomed in to get a better shot, but if you look at the stars in the picture, you can see them start to trail. If you use a zoom lens on your camera, 30-second exposures are out of the question unless you have some sort of tracking.
This is a picture of the open cluster, the Hyades. Notice they form a perfect 'V' with the tip pointing to the upper-righthand corner of the photo. Again, this is a 20-second exposure with NO zoom.