SHARPSTAR 200PNT PARABOLIC ASTROGRAPH F/3.2
The Sharpstar 200PNT is an astrograph with an ultra fast focal ratio of f/3.2 and a focal length of 420mm. This telescope installs a parabolic primary mirror, a large 790mm secondary mirror and a 4 elements 0.8x corrector to be placed before the focal plane. This optical design delivers a 44mm fully illuminated and corrected image circle for large sensors such as the full frame (24x36mm).
The mirror is made of H-PZ33 borosilicate glass with a similar low expansion coefficient of the Pyrex. The enhanced aluminum mirror coating ensures a reflectivity over 96%. The large 90mm secondary mirror is rigidly kept in place by the monopiece secondary mirror spider that does not bend or twist.
The large rack and pinion 3" focuser can be rotated 360°and it has a reduction gear of 1:10 for precise focusing. All the lenses used in the corrector are fully multi-coated and the tube is internally blackened to reduce reflections and absorb stray light.
The optical tube has a cooling fan on the primary mirror and an integrated dew heater. A digital panel shows temperature and humidity in real time.
The tube is made of carbon fiber, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.
Every SharpStar telescope is inspected on the optical bench by Testar and guaranteed against defects. To ensure optimal performance, reflector telescopes undertake the following tests:
- Inspection of the secondary mirror positioning
- Focuser orthogonality
- Collimation check by using a professional laser collimator.
| Optical design |
Newton reflector with integrated reflector |
|
Objective diameter |
200 mm |
|
Focal length |
640 mm (with 0.85x corrector) |
|
Focal ratio |
f/3.2 (with 0.85x corrector) |
|
Secondary mirror |
90 mm (minor axis) |
|
Obstruction |
35.0% |
|
Resolving power |
0.60 arc second |
|
Stellar limiting magnitude |
13.51 |
|
Max. magnification |
400 x |
|
Light gathering power |
816 times the human eye |
|
Mount attachment |
Losmandy style bar (254 mm) |
|
Focuser |
Rack & pinion, dual speed (10:1) 3" diameter |
|
Camera connection |
M48 x 0.75 male |
|
Corrector distance |
55 mm |
|
Tube weight |
9.46 kg (including tube rings and dovetail bar) |
|
Tube length |
633 mm |
|
Tube diameter |
280.5 mm |
|
Tube material |
Carbon fiber |
|
SKU |
SS-20032PNT |
- SharpStar 200 HNT f/3.2
- 281mm tube rings
- 254mm Losmandy style dovetail bar
- Handle on the rings
- Adapter to 2" and 1.25"
- Foam-lined aluminium case
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - M42 - HDR Composition of 9 x 30 sec. + 9 x 120 sec. + 9 x 360 sec.
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - Andromeda Galaxy - 34 x 300 sec.
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - Cepheus - 55 x 600 sec.
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - IC 1396 - 10 x 600 sec.
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - LDN1622 - 49 x 600 sec.
Michele Trungadi - SharpStar 200 f/3.2, QHY367C Full Frame - Cono Fox IC447 - 15 x 600 sec. - mosaic of 2 pannels