Well yes, but once you focus on an astronomical object you shouldn’t need to refocus, as long as you don’t change the eyepiece. Of course you do need to refocus every time you change the eyepiece, but I get more vibrations from incidental touching of the eyepiece. I have a problem with the camera. It’s very difficult to focus using the screen on the back of it. It’s so small and the resolution is so low you can’t really tell when it’s a sharp focus. Eventually I do get a reasonable focus, but with the manual focus it would take much longer, if I could do it at all without giving up.