Highlights 205mm aperture, 800mm 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 S11210 UPC 050234112109 Optical Info Optical Design Newtonian Mirror Coatings 94% Aluminum Glass Type Borosilicate Primary Aperture (mm) 203 F/Ratio 4 Focal Length (mm) 800 Secondary Diameter 70mm Secondary Obstruction (by diameter) 34% Secondary Obstruction by Area 12% Observational Info Dawes Limit 0.57 Rayleigh Limit 0.69 Limiting Mag. 14 Minimum Magnification 29 Maximum Magnification 400 Light Gathering (compared to next size down) 78% General Info Focuser 2" Dual Speed Crayford OTA Length (Retract/Ext.) 28" OTA Outer Diameter 9.375" OTA Weight (with accessories) 21 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
Related
Related
Related
Related