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The Quattro Imaging Newtonian is one of the most affordable telescopes with a f/4 focal ratio. This astrograph is capable of producing an exposure 6x faster than any f/10 optical tube. Even pricey refractors have trouble reaching a focal ratio this fast. Using a faster optical tube will shorten the exposure time giving you more time to photograph nebulae clusters and other deep sky objects. Like all Sky-Watcher reflectors our Quattro Imaging Newtonian features aluminum- coated borosilicate mirrors with a quartz overcoat producing 94% reflectivity. The optical system uses an oversized secondary mirror providing greater illumination for DSLRs and CCDs using full-frame sensors. The optical tube is constructed with rolled steel and features Sky- Watcher’s signature metal-flake Black Diamond finish on the exterior. The interior of the optical tube uses knife-edge baffles to absorb any stray light from ruining your images. As customary with all Sky-Watcher telescopes a boat-load of accessories are bundled with the optical tube. First is a 2-inch dual-speed 10:1 focuser with included 1.25-inch eyepiece adapter which provides flexibility for either 1.25-inch or 2-inch eyepieces. Also included are tube rings and a V-style dovetail plate as well as a 9×50 finderscope. For photographers looking to create a flat field and eliminate vignetting an optional coma corrector is available separately. Parabolic mirrors normally produce some aberrations around the edge of the field of view coma so this corrector is highly recommended for users with large imaging sensors and full-frame DSLRs.
- 205 mm Newtonian reflector
- 800 mm f/4
- Fully multi-coated borosilicate mirrors
- 2″ dual-speed 10:1 linear power focuser
- Tube rings with D-style dovetail bar