Old Pentor 500 mm or Apo telescoop
Our beloved earth rotates rather quickly, and a tripod mounted lens will show star trails after a few seconds exposure (the rotation at the celestial equator corresponds to about 15 arcseconds per second, and with a telephoto lens the stars show trails even in a one to two second exposure).
A tripod may be used for wide angle night sky photography, but to get sharp images with a telephoto lens or a small telescope a good tracking mount or equatorial mount is a must.
Put the camera on a tripod. Point the lens at Orions belt and take some test exposures (one, two, four ... thirthy seconds) and judge the star trails for yourself. Pont the lens at Polaris (half a degree from the northern celestial pole) and do the same test. The test images will for sure tell a lot about night sky photography and trailing.