SharpStar 15028HNT Hyperbolic Newtonian Astrograph
The SharpStar 15028HNT Hyperbolic Newtonian Astrograph is a compact 150mm f/2.8 reflector using an innovative optical design and multiple precision elements to provide a 44mm image circle that fills 36mmx44mm full-frame sensors with an ultra wide 6 degree field of view. This is the ideal instrument for astrophotographers looking to capture wide field deep sky targets with a super fast optical system.
The fast f/2.8 focal ratio arises from the integration of a 150mm hyperbolic primary mirror with enhanced aluminium coatings with 96% reflectivity. This type of mirror delivers reduced aberration and field curvature at the edge of the wide field of view. 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 with minimal chromatic aberration and outstanding field flatness.
The SharpStar 15028HNT is engineered and constructed to be durable for field use, yet portable and lightweight enough to make it easy to mount and handle. The scope uses an 18"-long carbon fibre tube and CNC aluminium fittings for a precision fit and finish. The 2.5” dual-speed rack and pinion focuser is capable of handling larger cameras and accessories without slipping. The focuser also comes with a 1.25" eyepiece holder for using the scope with small format cameras or even with eyepieces for visual observing. The back focus is 55mm from the M48x0.75 threaded adapter so Nikon/Canon DSLRs will readily come to focus when used with a wide 48mm camera-specific T ring (not included).
The SharpStar 15028HNT ships with both a Vixen style and Losmandy style dovetail plate, an innovative and attractive carry handle on top, and a hard-sided carrying case.
The total weight of the SharpStar 15028HNT with all accessories is just 5.95kg (13.1 lbs), making it an ideal match for many medium-capacity equatorial mounts.
FEATURES
150mm Aperture
f/2.8 focal ratio / 420mm focal length
Hyperboloid Primary Mirror made from H-PZ33 Glass (Similar to Pyrex)
Integrated, triplet, air-spaced corrector
44mm Fully Illuminated Imaging Circle
6º Field of View
Carbon Fibre Tube for Strength, Durability, Portability and Thermal Stability
All CNC Machined Aluminium Parts
Weighs less than 6kg fully loaded with dovetail / rings / handle!
0.77 Arc Seconds Resolution
2.5" R&P Precision Focuser with Exceptional Precision and Payload Capacity
55mm Back Focus from Corrector
Spot Diagram
Schematics
What's in the box
15028HNT Optical Tube
CNC Tube Rings
Losmandy & Vixen Style Dovetail
Handle
Eyepiece Adaptor
Storage Case
