Astronomy Specialist

ASKAR 203APO f/7 TRIPLET REFRACTOR

$13,999.00AUD
SKU: SS-203APO

Askar

Apochromatic triplet

23.5 kg

 

The Askar 203APO is an apochromatic air-spaced triplet refractor that offers high performance for a low price compared to other large 8" triplets on the market. The objective lens features an element of extra-low dispersion glass (ED) that minimizes chromatic aberration.

The Askar 203APO has a 20% larger effective aperture area than the 185APO, giving greater light-gathering power, resolution, brightness and contrast. Askar will soon release a dedicated field flattener and focal reducer for the 203APO, transforming it into a powerful astrograph ideal for imaging the solar system, galaxies, and planetary nebulae.

 

 

In its standard configuration the Askar 203APO is a high performance visual instrument with excellent optical quality and native compatibility with binoviewers when the rear section of the tube is retracted. This retractable rear tube features a rudder-type locking mechanism and is reinforced to ensure that the optical axis will not be affected with the tube is extended. With this section extended, the 203APO can be used with a regular diagonal and eyepiece. This design makes the 203APO a supremely versatile telescope.

The 3.5" dual-speed rack & pinion focuser is precise and rigid. It is natively compatible with most motorized focusers on the market including the ZWO EAF. The focuser includes an accurate distance scale with 10cm of travel. On the rear there is a 360 degree rotator with fine rotation angle markings for precise framing. The entire focuser barrel is CNC-machined with anti-reflective baffling and matte paint, minimizing stray light.

 

 

Unlike most refractors, the 203APO includes two finderscope bases on either side of the focuser, allowing you to attach both a standard guide scope and control unit such as the ASIAIR without the need for additional accessories. The handlebar also includes a finder-style slot, allowing for even more possibilities.

The entire tube of the 203APO is CNC-machined with anodized and surface sprayed coatings. The inner surfaces of the retractable dew shield are covered with matte felt and the interior of the telescope tube has matte paint and internal baffles, to reduce internal reflections and light scattering.

 

 

Note: The mount shown in the product images is not included with the telescope.

Specifications

 

Optical design

Apochromatic air-spaced ED triplet

Objective diameter

203 mm

Focal length

1421 mm

Focal ratio

f/7

Resolving power

0.57 arc second

Stellar limiting magnitude

14.24

Max. magnification

507.5 x

Light gathering power

841 times the human eye

Mount attachment

500 mm Losmandy-style dovetail

Focuser

3.5" rack & pinion dual speed 1:10

Tube weight

14.9 kg (23.5 kg with dovetail and rings)

Tube length

1145 mm with dew shield retracted

Tube diameter

206 mm

Dew shield diameter

229 mm

Connections

2", 1.25", M92 x 1 female

Length of retractable rear tube

150 mm

Threads on tube rings

TBD

Distance between outermost tube rings

353 mm

 

 

 

 

     Items included

      

    • 203APO OTA
    • Set of three tube rings
    • 500mm Losmandy bar
    • 2" visual back
    • 1.25" eyepiece adapter
    • Manual
    • Aluminium hardcase
    Downloads

     

     Instruction manual (coming soon)

     

    ASKAR 203APO f/7 TRIPLET REFRACTOR

    $13,999.00AUD

    Optical design

    Apochromatic triplet

    Image circle

    Focal ratio

    f/7

    Aperture

    203 mm

    Focal length

    1421 mm

    Optical thickness

    Threads

    2" Barrel, 1.25" Barrel, M92 x 1 Female

    Cooled

    Colour or Mono

    Pixel size

    Sensor dimensions

    Resolution

    Sensor diagonal

    Quantum efficiency

    Read noise

    Fullwell capacity

    Bit depth

    FPS

    Camera backfocus

    Filter size

    Filter size

    Bandpass (FWHM)

    Bandpass (FWHM)

    Glass thickness

    Mount type

    Payload capacity

    Latitude range

    Dovetail saddle

    Slew speed

    Encoders

    Periodic error correction

    Counterweight shaft

    Azimuth adjustment range

    Internal diameter

    Illuminated diameter

    Compatible telescope external diameter

    Weight

    23.5 kg

    Length

    Width

    Height

    View product