Hi, welcome to the world of 10mm-1000mm focal length telephoto lenses. You know, the ones so large you need to have an additional bipod minimum to support the lens while the tripod holds the camera. *shakes head* Seriously? How the hell do you think amateur astronomers get decent pictures of Jupiter and Saturn without a telescope? Lenses with a HUGE adjustable focal length, that are almost the size of the telescope itself. Might as well be a telescope at that point. Nice large aperture, too. AND THEN for shits and giggles you can throw a 5x Vivitar telezoom lens between that lens and the camera (assuming you have lenses using the same mount style.)
You must be confused with the DSLR world, thinking typical DSLR lenses. Plenty of HUGE lenses from back in the 60s even that have adapters to work with cameras of today.