Lunt LS50FHa/B600d1 H-alpha solar filter

The Lunt LS50FHa/B600d1 H-alpha solar filter is a H-alpha Single Pass Front Mount Etalon System for telescopes with 1.25" focuser and up to 540mm focal length. The LS50 Hydrogen-alpha filter system with 50mm aperture (no central obstruction) integrally tuned etalon for use on any refractor and many other telescopes. Because the LS50 has an estimated bandwidth of <0.75 Angstrom it is capable to providing high contrast views of both surface and edge detail.

This system includes the Lunt B600 blocking filter, which is usable for telescopes up to 540mm focal length. Larger blocking filters suitable for longer focal length are also optionally available. The B600 blocking filter is installed in a 90° star diagonal for 1.25" focuser. This diagonal is equipped with use with 1.25" eyepieces and also featires T2 camera connection.

Adding an additional available Double-Stack etalon system will reduce the bandwidth to ~<0.55 Angstrom.