Lunt LS100FHa Solar Filter

LS100FHa — 100mm Front-Mount H-Alpha Solar Filter A 0.45Å tilt-tuned etalon for two purposes: double-stack upgrade for existing Lunt 100mm 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 LS100FHa is a 100mm aperture front-mounted tilt-tuned H-alpha filter with a Root 3 non-centralized obstruction design and a verified bandpass of 0.45Å. It serves two distinct purposes — as a double-stack etalon for existing Lunt 100mm solar systems, or as a standalone H-alpha solar filter for a customer-supplied refractor.

As a double-stack filter: The LS100FHa places its 0.45Å tilt-tuned etalon in series with an existing Lunt 100mm etalon system, reducing combined system bandpass to <0.29Å. It is offered without a blocking filter for this purpose or for those who already own a compatible Lunt blocking filter.

As a standalone H-alpha filter for customer refractors: The LS100FHa retrofits a compatible customer-supplied refractor for daytime solar observation via the appropriate adapter. An adapter for refractors up to 102mm is included. For refractors over 102mm contact sales@luntsolarsystems.com for adapter pricing and availability. The filter is easily removable for night observing. A Lunt blocking filter must be used at all times — this is a safety requirement.

Specifications

• Model: LS100FHa
• Optical Aperture: 100mm — Root 3 non-centralized obstruction
• Tuning: Tilt-tuned
• Single Etalon Bandpass: 0.45Å — individually verified
• DS Combined Bandpass: <0.29Å when used to double-stack an existing Lunt 100mm system
• Compatible With: Existing Lunt 100mm systems (DS); customer refractors up to 102mm (standalone, adapter included); larger refractors — contact Lunt
• Blocking Filter Required: Yes — sold separately
• Weight: ~8 lbs
• Storage: Aluminum hard case with fitted foam