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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20
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Description
Lunt LS40F Hydrogen-Alpha Front-Mounted Etalon System B1200The LS40F brings hydrogen alpha solar observing within reach. This 40mm front mounted etalon converts your existing refractor into a capable solar telescope, revealing prominences, filaments, active regions, and chromospheric detail at a price point that makes H alpha accessible. The LS40F uses a center supported etalon designan approach with proven heritage in solar filtrationpaired with precision tilt tuning for smooth wavelength control. The design
The LS40F brings hydrogen-alpha solar observing within reach. This 40mm front-mounted etalon converts your existing refractor into a capable solar telescope, revealing prominences, filaments, active regions, and chromospheric detail at a price point that makes H-alpha accessible.
The LS40F uses a center-supported etalon design—an approach with proven heritage in solar filtration—paired with precision tilt tuning for smooth wavelength control. The design delivers a <0.65 angstrom bandpass: tight enough for rewarding views of solar activity, and an excellent foundation for observers ready to explore the chromosphere.
Each system ships complete with a B1200 blocking filter (6mm clear aperture, for focal lengths up to 540mm) and a custom adapter plate machined to fit your telescope. Provide your objective cell diameter when ordering, and we'll include the correct adapter at no charge—accommodating refractors with objective housings up to 4 inches.
Remove the system in seconds to return your refractor to nighttime duty.
Technical Note: This system is designed with a center-mounted foot to support the etalon. Consequently, the filter is center-obstructed.
Specifications:
- 40mm etalon with center-supported design (Note: Filter is center-obstructed)
- <0.65 angstrom bandpass (H-alpha, 656.28nm)
- Tilt-tuned wavelength control
- B1200 blocking filter included (6mm CA, up to 540mm FL)
- Custom adapter plate included (up to 4" objective cells—specify diameter at checkout)
- Visual and imaging capable
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy