Lunt 60mm H-Alpha Double Stack Filter (Front Mount)

LS60FHa — 60mm Front-Mount H-Alpha Solar Filter A 0.4Å 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 0.4Å. 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 0.4Å 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. If you are looking for a complete standalone package including a blocking filter and adapter, see Lunt's complete front-mounted filter packages at luntsolarsystems.com/collections/front-mounted-etalon-systems

Features:

• 60mm Front-Mount Aperture – Features a 60mm unobstructed optical aperture for detailed H-alpha solar observation.

• Precision 0.4Å Tilt-Tuned Etalon – Includes a 0.4Å etalon individually verified using Lunt’s precision metrology equipment.

• <0.28Å Double-Stack Bandpass – When paired with a second etalon in series, the LS60FHa delivers a combined system bandpass of less than 0.28Å.

• Dual-Purpose Design – Functions as a double-stack upgrade for compatible Lunt systems or as a standalone H-alpha solar filter for compatible customer-supplied refractors.

• Easy Installation & Removal – Front-mounted configuration allows convenient setup and removal, making it possible to switch between daytime solar and night-sky observing.

• Multiple Blocking Filter Options – Supports B600, B1200, B1800, and B3400 blocking filters to accommodate compatible telescopes with different focal lengths.

What's Included:

✓ Lunt 60mm H-Alpha Double Stack Filter (Front Mount)

✓ Aluminum Hard Case with Fitted Foam

✓ Instructional Manual

Specifications: