Lunt LS40FHa Front Mount 40mm Double Stack Solar Filter

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LS40FHa — 40mm Front-Mount Double Stack Solar Filter The double-stack upgrade for the Lunt LS40THa series. Two 0.35Å etalons in series — the tightest combined bandpass in the Lunt range. Now with new-generation etalons — every unit individually tested on Lunt's precision metrology equipment. Every specification is verified, not estimated. The LS40FHa is a 40mm aperture front-mounted tilt-tuned etalon designed for two purposes — as a double-stack upgrade for the Lunt LS40THa dedicated 40mm solar telescope series, or as a standalone H-alpha solar filter for a compatible customer-supplied refractor. As a double-stack filter for the LS40THa: The LS40FHa adds a second 0.35Å etalon to the optical path, placing two etalons of equal specification in series with the LS40THa's own front-mounted etalon — delivering a combined system bandpass of Show more