2 Item(s)
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  1. Astro-Tech 1" Extension ring for A-T Ritchey-Chrétien astrographs

    $32.95
    This Astro-Tech 1" long extension ring, installed between your Astro-Tech Ritchey-Chrétien astrograph and its focuser, helps you match the back focus required for your particular complement of imaging components . . .
  2. Astro-Tech 2" Extension ring for A-T Ritchey-Chrétien astrographs

    $34.95
    This Astro-Tech 2" long extension ring, installed between your Astro-Tech Ritchey-Chrétien astrograph and its focuser, helps you match the back focus required for your particular complement of imaging components . . .
2 Item(s)
Set Descending Direction