Lunt LS60FHa Front Mount 60 mm Double Stack Filter

LS60FHa — 60mm Front-Mount H-Alpha Solar Filter A 0.35Å tilt-tuned etalon for two purposes: double-stack upgrade for compatible Lunt systems, or standalone H-alpha filter for customer-supplied refractors. Now with new-generation etalons — every unit individually tested on Lunt's precision metrology equipment. Every specification is verified, not estimated. The LS60FHa is a 60mm aperture front-mounted tilt-tuned H-alpha filter with a verified bandpass of 0.35Å. It serves two distinct purposes — as a double-stack etalon for compatible Lunt systems, or as a standalone H-alpha solar filter for a customer-supplied refractor. As a double-stack filter: The LS60FHa places its 0.35Å tilt-tuned etalon in series with an existing Lunt etalon system, reducing combined system bandpass to <0.28Å. It is easily removable so the telescope can continue to be used for night observing. As a standalone H-alpha filter for customer refractors: The LS60FHa retrofits a compatible customer-supplied refractor for daytime solar observation via the appropriate adapter. A Lunt blocking filter must be used at all times — this is a safety requirement. Select the correct blocking filter for your telescope's focal length: B600 — up to 540mm focal length, 1.25" or 2" diagonal B1200 — up to 1,080mm focal length, 1.25" or 2" diagonal B1800 — up to 1,620mm focal length, 1.25" or 2" diagonal B3400 — up to 3,060mm focal length, 2" straight-through tube The LS60FHa is offered without a blocking filter for those who already own a compatible Lunt blocking filter, or for double-stack use where a blocking filter is already part of the system. Specifications Model: LS60FHa Optical Aperture: 60mm — no central obstruction Tuning: Tilt-tuned Single Etalon Bandpass: 0.35Å — individually verified DS Combined Bandpass: <0.28Å when paired with a second etalon in series Compatible With: Compatible Lunt systems (DS); customer-supplied refractors (standalone) Focal Length: Customer telescope Blocking Filter Required: Yes — sold separately Weight: ~3 lbs (~1.5kg) Storage: Aluminum hard case with fitted foam