The SharpStar 20032PNT Newtonian astrograph delivers premium performance at a remarkably affordable price. This compact 200mm f/3.2 reflector uses innovative optical design and multiple precision elements to provide a 44mm image circle that fills 36mmx44mm full-frame sensors with a 3.3 degree field of view. This is the perfect instrument for astrophotographers looking to capture nebulae, galaxies, and star fields in the Milky Way.
The ultra-fast f/3.2 focal ratio of the whole system is achieved by using a 200mm f/3.8 paraboloid, a 90mm plane secondary mirror of short axis, and a 3-inch four-element 0.85x error-correction mirror. The optics ensure excellent off-axis image flatness and correction. The primary and secondary mirrors are all made with aluminum with a protective coating for durability, and reflectivity is >96%. The mirror cell also includes a fan for fast cooling and acclimatization (power source sold separately).
A 3-inch special geared focuser ensures smooth operation without slipping, even with relatively heavy loads. The end of the focuser includes M54×0.75 threads. 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 20032PNT 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 25″-long carbon fiber tube and CNC aluminum fittings for a precision fit and finish.
The total weight of the SharpStar 20032PNT with all accessories is just 9.46kg (20.8 lbs), making it an ideal match for many medium-capacity equatorial mounts.
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. Alignment of the secondary mirror requires removal of the corrector optics using tools included with the telescope. Alignment of the primary mirror is accomplished as for a standard Newtonian reflector.
- Aperture: 200mm
- Focal Length: 760mm
- Ratio: 3.8
- Primary Mirror Type: Paraboloid
- Mirror Material: PZ33 (Similar to Pyrex)
- Corrector Type: Quartette Air-Spaced
- Correction Lens Focal Reduction Factor: 0.85
- System Focal Length / Ratio: 640mm / 3.2
- Short Axis Diameter of Secondary: 90mm
- Fully Illuminated Image Circle: 44mm
- Actual Field: 3.76º
- Main Tube: Carbon Fiber
- Main Tube Outer Diameter: 280.5mm
- Total Length of Telescope: 633mm
- Net Weight: 8 KG
- Gross Weight: 9.46 KG
- Resolution: 0.6
- Focuser: 3-inch Precision Focuser
- Visual Limiting Star Magnitude: 13.2
- Focal Plane: 55mm