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Universal Alan Gee II - Telecompressor (UAG II)



  • Schmidt-Cassegrain telecompressor/reducer and flatfield-corrector
  • For Schmidt-Cassegrain-telescopes with 2" eyepiece clamp or for direct connection to SC-thread through Baader T Adapter (BTA) for SC and MAK Telescopes (T-2 part #21) (#2408160) or Baader SC / HD Ultra Short T-Adaptor, 7mm optical length (#2958500B)
  • Variable reducing factor 5,9 to 3,5
  • Preconfigurated for use with T-2-thread of the Maxbright® II binocular and for Mark V Großfeld (Giant)-Binocular (#2456410) with T-2 quick changer
  • Can be used with T-2-eyepiece-clamps
  • Baader T-2 / 7.5 mm Extension Tube (T-2 part #25C) (#1508155) is included

Universal Alan Gee II - Telecompressor (UAG II)

The Universal Alan Gee II is the only telecompressor/reducer on the market which works fine with a binoviewer.

The standard Alan Gee Telecompressor Mark II was designed by Roland Christen (the producer of AstroPhysics apochromatic telescopes) as a reducer for Schmidt-Cassegrains which also delivers a flat field. The Universal Alan Gee II (UAG II) puts the optical elements of the Alan Gee in a regular 2" nose piece with an additional T-2-thread on the telescope side. The UAG II can be used for visual observations with Celestron EdgeHD telescopes. too.

The combination: Mark V Giant Bino / Baader 35mm ED-eyepieces / Universal Alan Gee II (UAG II) / Baader T2 Prism delivers a field of view of ca. 1,2° when used with a C8 – that's 72 minutes of arc, as much as a 2" 40mm eyepiece will show you! So, instead of waiting for an (unaffordable) 2" binoviewer, you can achieve the same effect on most SC-telescopes with the UAG II – be it monocular with a star diagonal or binocular with a binoviewer!

Please note that the reducing factor of the UAG II only depends on the distance between UAG II and eyepiece. It is designed for a working distance of 121mm then you get a reduction factor of 0.59. But if you focus to a focus plane farther away than the designed back focus of a Schmidt-Cassegrains or EdgeHD telescope, the focal length of the telescope itself becomes longer, and you get a different reducing factor than that which is calculated only from the distance between reducer ad eyepiece. The result depends on the individual adaptation and the telescope, we can't give a universal value for the reducing factor – but you will clearly notice the much larger field of view.


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