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Askar FRA600 4.3" 108mm F/5.6 Quintuplet Petzval Flat Field Astrograph


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  • High quality APO quintuplet refractor telescope
  • f/5.6 focal ratio
  • 600mm focal length
  • 4.3" / 108mm aperture
  • 66mm image circle
  • 14.3 lbs OTA weight

Product Details

  • The Askar FRA600 telescope was built with imaging in mind. The Petzval flat field design is optimized for use with today's full-frame astrophotography cameras for edge-to-edge sharp photos with minimal chromatic aberration and distortion.

    Askar FRA600 4.3" 108mm F/5.6 Quintuplet Petzval Flat Field Astrograph

    Askar FRA600 Refractor

    Featuring two ED lenses integrated into the front triplet, with a rear doublet flattens the field and reduces chromatic aberration, the Askar FRA600 quintuplet telescope is ready to take professional-quality photos of your favorite nebulae, galaxies and deep space objects. The two rear lenses have a diameter of 80mm, which counterbalances decreasing field illumination, allowing for sharp stars all the way to the edge of the 66mm image circle. Just add your DSLR or astrophotography camera to start capturing detailed images of the night sky.

    Askar FRA600 Sample Images

    Askar FRA600 Sample Image of Nebula
    Askar FRA600 Sample Image


    APO Quintuplet Refractor Telescope for Sharp, Clear Images

    Thanks to the flatfield 3 + 2 quintuplet optical design of the Askar FRA600, there is no need to add an additional flattener to adapt from visual to astrophotography. The large 4.2" rack-and-gear-based focuser offers smooth operation, even with heavy cooled cameras or DSLRs attached to the telescope. The dual-speed focuser allows for 1:10 micro adjustments, allowing you to take full advantage of the clarity this telescope offers.

    Askar FRA600 Spot Diagram

    Askar FRA600 Spot Diagram

    Askar FRA600 Telescope Light Path Askar FRA600 Telescope Light Path

    FRA600 Light Path


    Askar FRA600 Flat Field Refractor
  • specifications

    Aperture108mm (4.25")
    Back Focus160 mm
    Corrected Image Circle66 mm
    Focal Length600mm
    Focal Ratiof/5.6
    Glass TypeED
    Optical DesignPetzval
    Optical DesignQuintuplet
    Tube Diameter120 mm
    Tube Length493mm
    Tube Weight14.3 lb
  • included items

    • Askar 4.3" 108mm F/5.6 Quintuplet Petzval Flat Field Astrograph
    • Pair of tube rings
    • Handle
    • Dovetail plate
    • Sectional conical tube adapter (M54x0.75 and M48x0.75 male thread)
    • Inspection list
    • Manual

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