Orion 9974 StarBlast 4.5 Imaging Reflector Telescope Optical Tube An astonishingly affordable astrophotography-optimized reflector telescope Substantial 4.5" aperture primary mirror and very fast f/4 focal ratio produces stunning astrophotos with short exposure times. Fully illuminates small-chip CCD astrophotography cameras Compact, lightweight, easily transportable, and works well with 1.25" telescope eyepieces for observing Offered as an optical tube assembly only, tube rings and other accessories sold separately