Baader Hyperion Eyepiece - 13mm focal length - 1.25" - 68° The Hyperion 13mm is a beautiful universal eyepiece for long focal length systems (1:10 or less) such as Schmidt Cassegrain telescopes or Maksutovs. It serves as an entry-level eyepiece for the moon and planets, but also as a deep sky eyepiece for compact star clusters, nebulae or galaxies. In addition to the excellent imaging performance in the visual range, the Hyperion eyepieces also offer many photographic possibilities. You can adapt your camera directly via auxiliary threads on the eye side - precisely centered - for optimum image quality. You can change the focal length of the eyepiece with the optional Hyperion extension rings, without an additional lens element and therefore without any loss of quality. This allows you to get three magnification levels out of one eyepiece, with 1.25" and 2" insertion diameters available. This allows you to attach the eyepiece to any device - even with a narrow focal position. The eyepiece can be unscrewed for use with 2" filters. This means that these filters can also be used.