Order By Phone
STORE FRONT: 5348 Topanga Canyon Blvd, Woodland Hills CA 91364


Lunt - 50mm Ha Etalon Filter with B3400 for 2" Focuser


Be the first to review this product

Availability: In Stock


In Stock

Manufactured by: Lunt Solar Systems


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 B3400 blocking filter. This allows the Lunt H-alpha filter to be attached to any refractor with less than 3400mm of focal length. The Lunt Solar Systems B3400 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 B3400 blocking filter will provide a full disk image of the Sun with telescopes which have a maximum of 3400mm 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.


  • Lunt Solar Systems LS50 Hydrogen-Alpha Filter is an integrally 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.
  • B3400 blocking filter included for refractors with less than 3400mm focal length with a 2" focuser.











Product Series

Introducing the LS50 Hydrogen-alpha system..... To kick off the new company Lunt is offering the 50mm aperture (no central obstruction) integrally tuned etalon for use on any customer supplied refractor. System includes the B600 standard for use on telescopes up to 600mm focal length. *Blocking filter required.

 Because the LS50 has an estimated bandpass of <0.75 Angstroms it is capable to providing high contrast views of both surface and edge detail. Adding an additional etalon system will reduce the bandpass to ~<0.55 (dependant upon scope) allowing for higher resolution viewing and/or imaging. Specifications: • Aperture: 50mm • Focal Length: Customer Supplied Scope • Band Pass: <0.75 Angstroms RMS • Color: Pearl White with Black Anodize System Includes: • LS50 Ha Filter. • B600 Blocking Filter (Other sized available by request) • Re-enforced case with foam.

Additional Information

Name Lunt - 50mm Ha Etalon Filter with B3400 for 2" Focuser
Manufacturer Lunt Solar Systems
Model LS50FHa2/B3400
Manufacturer Part No LS50FHa2/B3400