Lunt LS50FHa Front Mount 50mm Double Stack Solar Filter

(1 customer review)


  • LS50FHa solar filter front-mounted non-obstructed hydrogen-alpha filter for use on Lunt ED Telescopes or Double Stacking an existing Lunt Solar System!
  • Accommodates LS60THA and LS60MT Telescopes without need for adapter
  • Connect the Lunt LS50FHa to an appropriately sized refractor of your choosing, or use it to double-stack on an existing Lunt 60mm Telescopes for a ~<0.5A band pass!
  • Choose the appropriate LS50FHa and blocking filter to match your Visual and/or Imaging requirements.

DSII Requirements: No adapter is needed to add one LS50FHa to another LS50FHa for double-stacking. Please note that the appropriate adapter plate will be shipped with the filter dependent upon your choice.




LS50FHa solar filter

The Lunt LS50FHa Solar Filter is a 50 mm aperture (no central obstruction) integrally tuned etalon for use on Lunt ED Refractors.

Lunt Solar will be introducing a larger selection of ED Telescopes that will meet your Solar needs for Daytime observing and meet the additional requirements of Nighttime observing.  In this way you can use one scope for day and night.

Lunt Solar also offer a full line of dedicated Solar Telescopes.

You MUST use a matching Lunt Blocking Filter with a Lunt Solar front mounted Filter (this is a safety requirement). For this reason choose the blocking filter that best suits your requirements for the system. It’s important to realize that a larger blocking filter is recommended for imaging due to the need for in-focus of the camera.

  • B600 – Visual Use
  • B1200 – Imaging and Visual Use
  • B1200 – Visual Use
  • B1800 – Imaging and Visual Use

Removing the LS50FHa Solar Filter for night use

The Lunt ED refractors are designed to retrofitted with the LS50FHa Hydrogen-alpha Filter.  In this way you can use the ED telescopes during the day. Notably, they are easily removable so that the Lunt ED scope can continue to be used for night observing.

Because the LS50FHa Solar Filter has an estimated bandpass of <0.70 Angstrom it is capable of providing high contrast views of both surface and edge detail. Significantly, adding an additional etalon system (double-stacking) will reduce the bandpass to ~<0.50. Allowing for higher resolution viewing and/or imaging. In addition, the part number LS50FHa is offered for this purpose or for those who already have a Lunt blocking filter.

LS50FHa Specifications: (single filter)
  • Optical Aperture: 50 mm
  • Etalon: Internal <0.70 Angstrom
  • Tuning: Tilt
  • Focal Length: ED80 (f/7) ED102 (f/7)
  • Filter Storage: Aluminum finished hard case with fitted foam
  • Filter Weight: 2 lb (~1kg)

See the latest Solar news from NASA.

Lunt Solar recommend that Customers pair their Lunt Filters with a Lunt product. This will guarantee the fit and performance of the entire system.

Effective October 1st 2016….

Due to the ever changing designs of 3rd party telescopes and the recent issues Lunt have had trying to match the “specifications” given by these manufacturers. Lunt will no longer offer adapter plates for 3rd party products.

1 review for Lunt LS50FHa Front Mount 50mm Double Stack Solar Filter

  1. Mike G Romine (verified owner)

    While researching the LS50FHa, I found it difficult to find photos of a direct comparison of single stack vs double stacked. It would have made my decision much easier to make. Afterall the idea of spending nearly as much for an upgrade as the value of the scope, is kind of hard to reconcile. I first looked at the Sun with the LS 60THa scope. I took pictures using a Canon EOS Ra camera. Then I attached LS50FHa and noticed an immediate difference visually. The pictures then confirmed that this is a definite keeper.

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