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Lunt Internal 0.4A Double Stack Module for LS130MT

SKU: LUN-DSII-LS130MTP
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Lunt Internal 0.4A Double Stack Module for LS130MT Lunt Double Stack Filter for Lunt 130 mm Telescope
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$2,995.00
 
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Lunt Internal Double Stack Module for LS130MT Telescopes

This Lunt Solar Systems internal double stack module for LS130MT measures ≤0.4Å FWHM per etalon, down from ~0.55Å. As of 2026, Lunt has improved their etalon manufacturing specification to deliver ≤0.4Å FWHM bandwidth. This is a 38% improvement over the previous ~0.55Å design.

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).

The result of this upgrade in this Internal Double-Stack module is an enhanced view of the Sun that reveals more detail, whether observing visually or imaging. This internal double-stack filter is user-installable and comes with a pressure tuner for Doppler tuning. The double stack module is compatible with Lunt LS130MT telescopes.