BORG 55FL EAA Tele Lens Set (3965)

Lightweight and compact telescope set customized to be used with astro cameras for celestial observation.
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Electro-optical viewing is a viewing method in which a CMOS camera is attached to an astronomical telescope instead of an eyepiece, and the celestial objects are projected on a computer screen.

Lightweight, compact and great optical performance telescope set featuring a comparatively short focal length of 250mm and fast aperture of f/4.5.

Great performance is achieved by adopting Canon Optron, Inc. fluorite glass elements in the optical construction. The precise optical design results in an extremely sharp image with less chromatic aberrations. Recommended for starry sky, nebula, star cluster, and planet observation.

Highlight features

  • Set of extremely compact barrel, helicoid type focusing unit combined with 55FL objective lens.

  • A camera with a 31.7mm (American size) sleeve insert type can be mounted without modification.

  • The optical tube is pre-installed with an Arca-Swiss type resin base, so it can be mounted on an Arca-Clamp without any modification.
    * The 55FL also comes with a finder base.

  • A 45mm width dovetail plate [3125] is included and can be attached to the optical tube via the pedestal without using the optical tube band.

  • The objective lens, helicoid and other major parts of this product are made in Japan.


Model Name BORG 55FL EAA Tele Lens Set
Product Code 3965
Focal Length, mm 250
Aperture f/4.5
Lens Construction 2 elements in 2 groups, fluorite apochromatic
Main Unit Weight, g 500
  • The eyepiece is a 31.7mm insert type.
  • Arca-Swiss type pedestal and viewfinder base are pre-installed.
  • 45mm dovetail plate [3125] is included.
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