Quattro 12" 300P Imaging Newtonian

305 mm Newtonian reflector 1200 mm (f/4) Fully multi-coated borosilicate mirrors 2” dual-speed 10:1 linear power focuser 8×50 finderscope Tube rings with D-style dovetail bar The new Sky-Watcher Quattro Imaging Newtonian with dual-speed focuser incorporates a superb mirror-set with two significant advantages over competing products. A 2" dual-speed 10:1 ratio focuser is included for excellent focusing precision. Additionally, the tube length has been slightly shortened to optimize performance for prime-focus photography. Even better performance for astro-photography, and visual use, can be achieved when used in combination with the Sky-Watcher Quattro coma corrector. Specifications Optical Info Optical Design Newtonian Mirror Coatings Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity Glass Type Borosilicate Primary Aperture (mm) 305 Primary Edge Thickness 38mm F/Ratio 4 Focal Length (mm) 1200 Secondary Diameter 102mm Secondary Obstruction (by di