Diagonal Telescope

My new telescope has piqued my curiosity–More specifically, why is it that when looking into the eyepiece we don’t see the cross shaped mount for the diagonal mirror (or the mirror itself?) in the image? I can’t get my head around the problem and it’s been so long since I did optic physics that I’ve [...]

Apochromatic refractors due to their unobstructed, text-book like diffraction patterns produce the sharpest, highest quality optical imaging available bar-none, aperture for aperture, of any telescope optical system. These breathtakingly pristine celestial views are coveted by experienced amateur astronomers. While the cost is expensive compared to a Newtonian reflector of similar aperture, during those cherished moments [...]