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Askar FRA400

$1,284.66

The brand new ASKAR FRA series! The FRA, which stands for “FLATFIELD REFRACTIVE ASTRAGRAPH”, is a refractive astrograph designed for built-in flat field correction. FRA also used in visual observation, this series creates versatile high-quality flat frame images for astrophotography, is the few great telescope of versatile optical tube.

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SKU: ASC26800 Categories: , , ,
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The brand new ASKAR FRA series, short for “FLATFIELD REFRACTIVE ASTRAGRAPH,” revolutionizes refractive astrographs with built-in flat field correction. FRA, which is also suitable for visual observation, offers a versatile solution for generating high-quality flat frame images for astrophotography, making it one of the few great telescopes of versatile optical tube assemblies (OTAs).

The first member of the FRA family, featuring a Petzval-like quintuplet design (including two special ED glass elements), boasts a 72mm aperture, a 400mm focal length, and a focal ratio of f/5.6, providing a generous 44mm image circle for your imaging needs.

The FRA400 quintuplet astrograph showcases modern optical design with a retractable dew shield, a 3″ rack-and-gear-based high-precision reducer complete with a 360-degree rotator and M68×1 thread, as well as a 2″ adapter ring and a 1.25″ visual adapter. Furthermore, the reducer comes equipped with fine focal adjustment functionality, enabling precise calibration in practical observations or sky imaging using its optical tube assembly (OTA).

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  • Aperture: 72mm
  • Focal length: 400mm
  • Focal ratio: f/5.6
  • Objective type: Quintuplet dual ED air-spaced APO
  • Image circle: 44mm
  • Back focus: 140mm (from the end of rotator M68x1 thread)
  • Overall length: 317mm
  • Weight: 2.56kg
  • Back-end adapter: M68×1 male thread, 2″ adapter/1.25″ adapter

Additional features and accessories:

  • Retractable dew shield
  • 3″ rack-and-gear-based high-precision reducer with a 360-degree rotator
  • Tube rings with practical attachments on three sides
  • Fine focal adjustment function for precise calibration
  • Optional ultra focal reducer to achieve a focal ratio of f/3.9
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