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 diameter) 33% Secondary Obstruction by Area 11% Observational Info Dawes Limit 0.38 Rayleigh Limit 0.46 Limiting Mag. 14.9 Minimum Magnification 43 Maximum Magnification 600 Light Gathering (compared to next size down) 44% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext.) 42.5" OTA Outer Diameter 14.25" OTA Weight (with accessories) 57 lbs Accessories Included Finder 9x50 Finder Included Diagonal No Mounting Accessories Rings/D-Rail Included Eyepieces None Included Case No Corrector No (optional)