Lunt LS100FHa Solar Filter

(1 customer review)


  • 100mm front-mounted minimally obstructed hydrogen-alpha filter for use on a wide range of telescopes!
  • Connect the Lunt LS100FHa to your telescope with the appropriate adapter (sold separately), or use it to double-stack on an existing Lunt 100mm solar telescope or filter for a ~<0.5A band pass!
  • Choose the appropriate LS100FHa and blocking filter for your telescope’s focal length and focuser size.

Required Accessories: Typically an adapter plate will be required to attach a Lunt Solar Filter to the front of a customer-supplied telescope. These adapters are in stock for the more common user scopes, but can be custom-made to your specific requirement.  An adapter is needed to add a LS100/DS module to a LS100FHa.

Please Note: If this product shows “Available on Backorder” and you would like to “get in line” by placing an order with a 10% deposit, send us an email. A member of our staff will contact you with lead times and deposit information.

Estimated lead time: send us an email.

Available on backorder


LS100FHa Solar Filter

The Lunt LS100FHa Solar Filter is a 100 mm aperture with a Root 3 non-centralized obstruction  integrally tuned etalon for use on a customer-supplied refractor.

The standard system includes the B600 blocking filter, which provides full disk images on telescopes with up to 540 mm of focal length. Larger blocking filters suitable for longer focal length telescopes are also available options.

These Hydrogen-alpha filters are designed to retrofit (adapters required) the customer-supplied telescope for use during the day. They are easily removable so that the scope can continue to be used for night observing.

LS100FHa Solar Filter systems include a front-mounted filter and a rear mounted 2″ or 1.25″ blocking diagonal. Choose the blocking filter that best suits your telescope and your focuser size:

  • B600 –   Up to 540 mm focal length, offered in 1.25″ or 2″ diagonal
  • B1200 – Up to 1080 mm focal length, offered in 1.25″ or 2″ diagonal
  • B1800 – Up to 1620 mm focal length, offered in 1.25″ or 2″ diagonal
  • B3400 – Up to 3060 mm focal length, offered in 2″ straight-through tube

Because the LS100FHa Solar Filter has an estimated bandpass of <0.70 Angstroms it is capable of providing high contrast views of both surface and edge detail. Adding an additional etalon system (double-stacking) will reduce the bandpass to ~<0.50 (dependent upon scope) allowing for higher resolution viewing and/or imaging. The part number LS100FHa is offered for this purpose or for those who already have a Lunt blocking filter. A Lunt blocking filter must be used with Lunt Ha filters at all times.

LS100FHa Specifications: (single stacked)

  • Optical Aperture: 100 mm
  • Etalon: Internal <0.7 Angstrom
  • Tuning: Tilt
  • Storage: Aluminum finished hard case with fitted foam
  • Weight: 8 lb

Find information about the Sun from NASA

1 review for Lunt LS100FHa Solar Filter

  1. Dan Mitchell

    Have had the LS100FHa under the sun for several sessions and it makes everything POP. Contrast and detail are enhanced and pleasing to observe even in this solar minimum .There is always something interesting when observing with a DS.
    The view in my LS100THA remains bright and I was surprised that proms stayed visible and nicely detailed with the DS.
    Absolutely no red glow or ghosting noticed.
    Tuning is a snap, Start with your SS , then screw the DS on .
    The tuning wheel is not reachable while at the eyepiece and I had my wife move it while I watched and when it gets close to being on band the brightness increases dramatically and your there. I’ve found it to be a set and forget filter
    Its worth the price if you want the WOW factor.

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