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Lunt - 50mm Ha Etalon-Filter-System with B1800 Blocking Filter for 2" Focuser


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Manufactured by: Lunt Solar Systems


Lunt Solar Systems -  50mm H-alpha Filter  with  B1800 Blocking Filter  for 2 " Focuser 


  • Lunt Solar Systems LS50 Hydrogen-Alpha Filter is an internally tuned Etalon system with 50mm aperture.
  • Provides incredibly high contrast views of solar surface and edge details.
  • Lunt Solar Systems LS50 Hydrogen-Alpha Filter has an estimated bandpass of <0.7 Angstroms.
  • B1800 blocking filter included for refractors with less than 1620mm focal length with a 2" focuser.



The new Lunt Solar Systems LS50 Hydrogen-Alpha Filter incorporates a unique design feature which decreases chances of decontaction (breakage) and increases solar filter thermal stability, an important factor since even the slightest temperature change can cause poor h-alpha performance. Since solar prominences tend to fade into the bright background sky at 1.0 angstroms, the Lunt Systems Solar Filter's performance at <0.7 angstroms gives above average contrast and definition.

Another addition to the Lunt Solar Systems LS50 Hydrogen-Alpha Filter is the supplied B1800 blocking filter. This allows the Lunt H-alpha filter to be attached to any refractor with less than 1620mm of focal length. The Lunt Solar Systems B1800 Blocking Filter houses an additional filter in a 2" straight through with a tiltable filter mechanism. The blocking filter is just as crucial to your safety and the system's performance as the front element of the Lunt LS50 solar package! The secondary blocking filter is based on the focal length of your telescope because blocking filters shape the spectral output. The Lunt Solar System's B1800 blocking filter will provide a full disk image of the Sun with telescopes which have a maximum of 1620mm of focal length. It is important to chose your Lunt h-alpha filter solar filter carefully, because using a larger blocking filter than necessary to achieve a full disk image in your telescope system may result in image "ghosts" at the edge of the field of view.

Because the Lunt 50mm H-Alpha Front Mount Filter is unique, the h-alpha blocking filter is also unique. Lunt will only warranty the safety and/or performance of their solar systems when a Lunt Solar Systems blocking filter is paired with a Lunt Solar Systems Etalon system.









Additional Information

Name Lunt - 50mm Ha Etalon-Filter-System with B1800 Blocking Filter for 2" Focuser
Manufacturer Lunt Solar Systems
Model LS50FHa2/B1800
Manufacturer Part No LS50FHa2/B1800