The SharpStar 15028HNT Newtonian astrograph is a compact 150mm f/2.8 reflector that uses an innovative hyperbolic optical design and multiple precision elements to provide a 44mm image circle that fills 36mm x 44mm full-frame sensors with a 6 degree field of view.
The super-fast f/2.8 focal ratio is available through the integration of a 150mm hyperbolic primary mirror with enhanced aluminum coatings with 96% reflectivity. The large 70mm secondary mirror passes light through a three-element corrector lens to deliver a crisp, sharp, and bright image over the entire 44mm image circle.
The SharpStar 15028HNT is portable and lightweight with its 18″ carbon fiber tube and CNC aluminum fittings. It includes a 2.5” dual-speed rack and pinion focuser offers handles larger cameras and accessories without slipping. The focuser also comes with a 1.25″ eyepiece holder for using the scope with smaller cameras or even with eyepieces for visual observing. The backfocus is 55mm from the M48 x 0.75 threaded adapter so Nikon/Canon DSLRs will readily come to focus when used with a wide 48mm camera-specific T ring.
The SharpStar 15028HNT includes with both a Vixen style and Losmandy style dovetail plate, a carry handle, and a hard-sided carrying case.
– Aperture: 150mm
– Focal Length: 420mm
– Focal Ratio: f/2.8
– Weight: 13.2 lbs.
– Optical Coatings: Enhanced Aluminum 96% reflective
– Back Focus: 55 mm from the M48x0.75 threaded adapter
You can learn more here.
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