About this product
Part Number: 13028HNT
Sharpstar took the initiative in launching the very first 150mm hyperbolic Newtonian reflective telescope with an extremely-fast focal ratio of f/2.8(15028HNT). It has garnered a quite a large following since its introduction. Not indulging in this great achievement, Sharpstar has expanded on its creativity and dynamism, introducing the 13028HNT to their customers, which has the same focal ratio but a slightly smaller aperture.
The 13028HNT, with a hyperbolic primary mirror, produces round and sharp stars within the full-frame format and supports a 44mm image circle. Compared with a focal ratio of f/4, the 13028HNT can attain the same image quality with almost half the exposures. In addition, due to the compact and concise design of the telescope tube and excellent portability, it offers fantastic performance for those who like to travel to dark sky sites.
The primary mirror is made of Pyrex-alike glass PZ33. The thermal expansion coefficient is smaller than ordinary glass. The dielectric multilayer coating makes the primary mirror obtain a highly reflectiveness of up to 97%. The minor axis of the secondary mirror is 65mm, enabling sufficient illumination for full-frame imaging. It’s worth mentioning that, the corrector design is a two-refractive-lens set, one of which is an ED glass, aiming to simplify the optical system while enhancing the aberration correction performance.
The telescope tube is totally made of high-end carbon fibre material, so the weight of the telescope can be reduced.
All the component parts are from CNC manufactured metals. The pair of tube rings feature a pierced design. It may increase the production cost, but will absolutely offer extraordinary customer experience because of its lightweight and detail-oriented design concept.
The focuser is a 2.5" rack-and-pinion device. It’s equipped with coarse as well as fine adjustment hand knobs to further improve the focusing precision. The focuser is tapped with an M63 thread which can be switched into a more general M48×0.75 thread with an adapter ring(included). Thus the user has a wider range of options in connecting other astronomy accessories to the focuser. The back-focus is the standard 55mm(starting from the base of the mounting thread on the adapter ring’s housing), which is user-friendly for most users.
A versatile handle and a standard Vixen-style dovetail plate are also included in the 13028HNT package.
- Focal length of primary mirror：364mm
- Focal ratio of primary mirror：f/2.8
- Primary mirror type：Hyperbolic reflective mirror
- Primary mirror material：PZ33（similar to Pyrex glass）
- Corrector：two-element air-spaced refractive lenses（including one ED glass）
- Minor axis of secondary mirror：65mm
- Image circle：44mm
- Field of view：6.9 degree
- Main tube material：High-end carbon fibre
- Main tube outer diameter：174mm
- Main tube length：394mm
- Net weight：3.2kg
- Gross weight：4.3kg（including protective cap, tube rings, handle and Losmandy-style dovetail plate）
- Resolution：0.89 arc second
- Focuser：2.5" with fine-adjustment
- Limiting visual magnitude：12.3
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