Astronomy Specialist



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The Sharpstar 200PNT is an astrograph with an ultra fast focal ratio of f/3.2 and a focal length of 640mm. This telescope installs a parabolic primary mirror, a large 790mm secondary mirror and a 4 elements 0.85x 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 aluminium 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. The focuser is compatible with the ZWO EAF electronic focuser bracket.

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 dew heater and fans require an external 12V DC power supply (not supplied with the scope).

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)



    Resolving power

    0.60 arc second

    Stellar limiting magnitude


    Max. magnification

    400 x

    Light gathering power

    816 times the human eye

    Mount attachment

    Losmandy style bar (254 mm)


    Rack & pinion, dual speed (10:1) 3" diameter

    Camera connection

    M68 female, M54 female, 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






    • 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 (81cm x 38cm x 70cm high)



    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 panels


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