Lunt Internal 0.35A Double Stack Module for LS152THa
Lunt Solar Internal Double Stack Module for Lunt LS152THa
As of 2026, Lunt has improved their etalon manufacturing specification to deliver ≤0.35Å FWHM bandwidth. This is a 40% improvement over the previous ~0.55Å design. When used in double-stack systems, this translates to system bandwidth of around 0.22Å. This improvement is achieved through tighter coating tolerances and refined manufacturing procedures, and very production etalon is verified on Lunt’s 1.5-meter Sciencetech scanning monochromator at 656.28 nm, and the plate parallelism confirmed on their Zygo Verifire interferometer (factory certified by Zygo).
For existing Lunt systems, adding a new etalon to a previous-generation double-stack achieves approximately 0.27Å.
This Internal Double Stack Module by Lunt Solar fits inside the stock model LS152T scope. This product uses Lunt's Pressure Tuning system for True Doppler Tuning effects for solar observing. The LS152THa does not need to be returned to the factory for double-stacking. Do it yourself!
Note: This product can only be used and installed in a Lunt Solar model LS152THa Solar Telescope! Not a solar filter used by itself!