Highlights 254mm aperture, 1000mm focal length Fast f/4 focal ratio Parabolic mirror designed for imaging with 94% reflectivity 10:1, dual-speed, 2-inch Crayford-style focuser Oversized secondary mirror produces greater illumination for full-frame DSLR and CCD cameras Tube rings, mounting plate, eyepiece adapters, and 9x50 finder scope included 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 astrophotography, and visual use, can be achieved when used in combination with the Sky-Watcher Quattro coma corrector. Specifications SKU S11220 UPC 050234112208 Optical Info Optical Design Newtonian Mirror Coatings 94% Aluminum Glass Type Borosilicate True Aperture (mm) 257 Primary Aperture (mm) 254 F/Ratio 4 Focal Length (mm) 1000 Secondary Diameter 89mm Secondary Obstruction (by diameter) 35% Secondary Obstruction by Area 12% Observational Info Dawes Limit 0.46 Rayleigh Limit 0.55 Limiting Mag. 14.5 Minimum Magnification 36 Maximum Magnification 500 Light Gathering (compared to next size down) 57% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext.) 36.5" OTA Outer Diameter 11.375" OTA Weight (with accessories) 36.5 Accessories Included Finder 9x50 Finder Included Diagonal No Mounting Accessories Rings/V-Rail Included Eyepieces None Included Case No Corrector No (optional) Shipping Weights & Dimensions
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