Orion ShortTube 80 Refractor Telescope Optical Tube Assembly (White) An ideal refractor telescope optical tube assembly for use as a guide scope with a CCD autoguider, or for wide-field observations Fast, wide field-of-view optics excel at guide star acquisition and viewing expansive celestial objects Fully multi-coated 80mm aperture f/5.0 optics deliver bright, wide-field images with sharp resolution Weighs just 2.95 lbs. and measures 15&amp;quot; long - can easily be added to an astrophotography system without overloading your telescope mount Sold as optical tube assembly only without accessories - accessories sold separately