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. 

• 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