Sharpstar 130mm f/2.8 HNT Hyperbolic Newtonian Astrograph (Aluminum Tube)
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- 130mm Newtonian astrograph with super-fast f/2.8 optics and 55mm backfocus
- Fully and rigorously tested on site for cosmetics, mechanical operation, and optical performance by a master optician to ensure excellent overall telescope operation and customer satisfaction (an Agena exclusive service)
- Hyperbolic primary and 2-element ED corrector lens deliver sharp flat images over a large 44mm image circle
- 15.7” long aluminum tube and CNC machined aluminum fittings make for a durable yet lightweight instrument
- 2.5” rack and pinion focuser handles heavy loads without slipping; includes 1.25" holder for smaller cameras or eyepieces
- Includes carrying handle, Vixen-style dovetail plate, and hard carrying case
The SharpStar 13028HNT hyperbolic Newtonian astrograph delivers premium performance at a remarkably affordable price. This compact 130mm f/2.8 reflector uses innovative optical design and multiple precision elements to provide a 44mm image circle that fills 36mmx44mm full-frame sensors with an astonishing 6.9 degree field of view. This is the perfect instrument for astrophotographers looking to capture large nebulae, galaxies, and star fields in the Milky Way.
The super-fast f/2.8 focal ratio arises from the integration of a 130mm hyperbolic primary mirror with enhanced aluminum coatings with 97% reflectivity. Sharpstar used Pyrex-like PZ33 glass for the mirror substrate to ensure good thermal performance. This hyperbolic mirror is far more difficult to grind and polish compared to standard parabolic primaries, but it delivers reduced aberrations and field curvature at the edge of the wide field of view. The large secondary mirror spans 65mm along the minor axis and passes light through a two-element corrector lens (with one ED element) to deliver a crisp, sharp, and bright image over the entire 44mm image circle with minimal chromatic aberration and outstanding field flatness.
The SharpStar 13028HNT 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 15.7"-long aluminum tube and CNC aluminum fittings for a precision fit and finish. The 2.5” dual-speed rack and pinion focuser 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 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 13028HNT includes a Vixen style dovetail plate, an innovative and attractive carry handle on top, and a hard-sided carrying case.
The total weight of the SharpStar 13028HNT with all accessories is just 5kg (11 lbs), making it an ideal match for many medium-capacity equatorial mounts.
Full Optical and Mechanical Testing and Quality Control - An Agena Exclusive!
Agena does much more than simply move the telescope boxes from Sharpstar to you. Each Sharpstar imaging Newtonian telescope at Agena undergoes a thorough physical, mechanical, and optical evaluation at our shop upon arrival - all at no extra cost to you.
Every telescope is inspected to ensure good cosmetics, collimation, smooth focuser operation, and to make sure all parts are included by the manufacturer. Most importantly, we also check each telescope using a rigorous three-point on-site optical evaluation consisting of the following optical bench tests to ensure that your telescope delivers excellent optical performance:
- Foucault Test: This knife-edge test is performed at the center of curvature of the primary mirror to evaluate the quality of the mirror's conic shape.
- Ronchi Test: We then perform a Ronchi grating test at the center of curvature at inside focus, at focus, and outside focus. This is a qualitative method to evaluate primary mirror smoothness and figure.
- Star test: Finally, we collimate the complete telescope and perform an autocollimation test with an artificial star to examine the overall system's image performance at the focus point.
This testing is performed and certified by a master optician to make sure each Sharpstar instrument sold by Agena has excellent optical performance before it ships.
PLEASE NOTE: This precision astrograph has extremely fast optics and tight alignment tolerances. We recommend collimation each time it is transported or jostled. There is a link to collimation instructions under the "Additional Resources" tab. You will require a 1.25" Cheshire collimator and a 1.25" laser collimator.
Specifications:
- Aperture：130mm
- Focal length of primary mirror：364mm
- Focal ratio of primary mirror：f/2.8
- Primary mirror type：Hyperbolic 97% reflective mirror, center marked
- 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：Aluminum
- Main tube OD：174mm
- Total front OD: 180mm / 7.0"
- Main tube length: 400mm
- Net weight：7.0lbs (3.2kg)
- Gross weight：11lbs (5kg)（including protective cap, tube rings, handle and Vixen-style dovetail plate）
- Resolution：0.89 arc second
- Focuser：2.5" with micro-adjustment
- Finderscope base: Yes, standard
- Focuser height/travel: 80mm/20mm
- Dovetail bar/length: Standard Vixen-style/290mm
- Mounting rings: Hinge style with locking knobs
- Limiting visual magnitude：12.3
- Back-focus：55mm
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 301 - 400mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 130mm Newtonian astrograph with super-fast f/2.8 optics and 55mm backfocus
- Fully and rigorously tested on site for cosmetics, mechanical operation, and optical performance by a master optician to ensure excellent overall telescope operation and customer satisfaction (an Agena exclusive service)
- Hyperbolic primary and 2-element ED corrector lens deliver sharp flat images over a large 44mm image circle
- 15.7” long aluminum tube and CNC machined aluminum fittings make for a durable yet lightweight instrument
- 2.5” rack and pinion focuser handles heavy loads without slipping; includes 1.25" holder for smaller cameras or eyepieces
- Includes carrying handle, Vixen-style dovetail plate, and hard carrying case
The SharpStar 13028HNT hyperbolic Newtonian astrograph delivers premium performance at a remarkably affordable price. This compact 130mm f/2.8 reflector uses innovative optical design and multiple precision elements to provide a 44mm image circle that fills 36mmx44mm full-frame sensors with an astonishing 6.9 degree field of view. This is the perfect instrument for astrophotographers looking to capture large nebulae, galaxies, and star fields in the Milky Way.
The super-fast f/2.8 focal ratio arises from the integration of a 130mm hyperbolic primary mirror with enhanced aluminum coatings with 97% reflectivity. Sharpstar used Pyrex-like PZ33 glass for the mirror substrate to ensure good thermal performance. This hyperbolic mirror is far more difficult to grind and polish compared to standard parabolic primaries, but it delivers reduced aberrations and field curvature at the edge of the wide field of view. The large secondary mirror spans 65mm along the minor axis and passes light through a two-element corrector lens (with one ED element) to deliver a crisp, sharp, and bright image over the entire 44mm image circle with minimal chromatic aberration and outstanding field flatness.
The SharpStar 13028HNT 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 15.7"-long aluminum tube and CNC aluminum fittings for a precision fit and finish. The 2.5” dual-speed rack and pinion focuser 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 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 13028HNT includes a Vixen style dovetail plate, an innovative and attractive carry handle on top, and a hard-sided carrying case.
The total weight of the SharpStar 13028HNT with all accessories is just 5kg (11 lbs), making it an ideal match for many medium-capacity equatorial mounts.
Full Optical and Mechanical Testing and Quality Control - An Agena Exclusive!
Agena does much more than simply move the telescope boxes from Sharpstar to you. Each Sharpstar imaging Newtonian telescope at Agena undergoes a thorough physical, mechanical, and optical evaluation at our shop upon arrival - all at no extra cost to you.
Every telescope is inspected to ensure good cosmetics, collimation, smooth focuser operation, and to make sure all parts are included by the manufacturer. Most importantly, we also check each telescope using a rigorous three-point on-site optical evaluation consisting of the following optical bench tests to ensure that your telescope delivers excellent optical performance:
- Foucault Test: This knife-edge test is performed at the center of curvature of the primary mirror to evaluate the quality of the mirror's conic shape.
- Ronchi Test: We then perform a Ronchi grating test at the center of curvature at inside focus, at focus, and outside focus. This is a qualitative method to evaluate primary mirror smoothness and figure.
- Star test: Finally, we collimate the complete telescope and perform an autocollimation test with an artificial star to examine the overall system's image performance at the focus point.
This testing is performed and certified by a master optician to make sure each Sharpstar instrument sold by Agena has excellent optical performance before it ships.
PLEASE NOTE: This precision astrograph has extremely fast optics and tight alignment tolerances. We recommend collimation each time it is transported or jostled. There is a link to collimation instructions under the "Additional Resources" tab. You will require a 1.25" Cheshire collimator and a 1.25" laser collimator.
Specifications:
- Aperture：130mm
- Focal length of primary mirror：364mm
- Focal ratio of primary mirror：f/2.8
- Primary mirror type：Hyperbolic 97% reflective mirror, center marked
- 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：Aluminum
- Main tube OD：174mm
- Total front OD: 180mm / 7.0"
- Main tube length: 400mm
- Net weight：7.0lbs (3.2kg)
- Gross weight：11lbs (5kg)（including protective cap, tube rings, handle and Vixen-style dovetail plate）
- Resolution：0.89 arc second
- Focuser：2.5" with micro-adjustment
- Finderscope base: Yes, standard
- Focuser height/travel: 80mm/20mm
- Dovetail bar/length: Standard Vixen-style/290mm
- Mounting rings: Hinge style with locking knobs
- Limiting visual magnitude：12.3
- Back-focus：55mm
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 301 - 400mm |
| Hide Found a better Shipped Price on Frontend? | No |
Sharpstar 130mm f/2.8 HNT Hyperbolic Newtonian Astrograph (Aluminum Tube) # 13028HNT-AL