F/2.8 Newtonian Hyperbolic Astrograph with Built-In Three Element Corrector
The SharpStar 150 mm Newtonian reflector telescope features an f/2.8 focal ratio for super wide field images. The hyperbolic primary mirror is made of glass similar to Pyrex, which greatly reduces spherical aberration. Coma is further reduced by the 3-element air-spaced corrector integrated into the 2.5" dual speed rack & pinion focuser.
Aluminum coatings are applied to both the primary and secondary mirror for 96% reflectivity. The OTA is made of high quality carbon fiber for lightweight strength, and other components are CNC machined of aluminum and other quality metals.
Flat Images Across a Wide 6º Field of View
The Sharpstar 15028HNT, or 150 mm f/2.8 Hyperbolic Newtonian Telescope, produces a 44 mm image circle for full frame results. The image above displays both the 130 mm and 150 mm HNT telescopes riding on an optional mount. While the 130 mm f/2.8 is smaller, the 150 mm f/2.8 model is still quite portable; weighing just 13.1 pounds including the rings, handle and dovetail. The length of the 15028HNT is only 18 inches, making it really easy to take on the road.
Focal Plane Diagram
The schematic diagram of the 150 mm f/2.8 Sharpstar HNT depicts the primary and secondary mirror, as well as the X-shaped strut that holds the secondary mirror in place. The strut, or spider, is fabricated from one piece of metal for stability. Also note that the back focus is a standard 55 mm, making it easier to achieve precise focus with your DSLR, CMOS, or CCD camera.
2.5" R&P Focuser
The focuser that comes with the Sharpstar 15028HNT is a large, 2.5" rack-and-pinion dual speed model with coarse and fine adjustment knobs. The focuser has a M48x0.75 thread to accommodate most stock imaging devices as well as adapters such as 48mm T-Rings for your DSLR camera. This Newtonian Astrograph optical tube also includes a Losmandy-style dovetail plate, as well as tube rings with an integrated handle.
As mentioned below, the stock focuser on the 150 mm HNT terminates in M48 x 0.75 threads. If you are using a DSLR, simple attach it to the rear of the focuser with a 48 mm T-ring for your camera model. The schematic shows how to attach a CCD or CMOS camera. Which adapters you require depends on whether you will be adding an OAG or filter wheel, etc. to the optical chain or foregoing those accessories and connecting the astronomy camera as a stand-alone unit. All adapters and accessories mentioned above are sold separately.
