Lunt Solar Systems 60mm f/8.3 HA Single Etalon Refractor Solar Telescope, 2" Crayford Focuser, 6mm Blocking, Tilt-Tuned

The Lunt LS60THa is a complete h-alpha solar telescope. The refractor-based system has a precision-aligned singlet chromatic lens with a 60 mm aperture. The front singlet lens reduces half the stray light of an achromat, fully eliminating the possibility of on-axis coma, astigmatism, de-centering aberrations, and provides, with the matched collimation lens set, a full spherical corrected flat-field solar telescope. The focal length is 500 mm, providing a 4.5 mm image through a 6 mm blocking filter. Fine adjustment is achieved with a 2" Crayford-style focuser or Feather Touch focuser with 10:1 reduction. An internal etalon with tilt-tune adjustment allows for a <0.75 Angstrom bandpass.