Lunt Solar Systems Filters LS60FHa B1800 1.25" etalon filter system (33253)

The Lunt Solar Systems LS60FHa B1800 1.25" etalon filter system is a specialized H-alpha solar filter designed for safe and high-contrast observation of the Sun. This system is intended for use with refractor telescopes that have a 1.25" focuser and is suitable for telescopes with a focal length of up to 1800mm for visual observation, or up to 1200mm for solar imaging. The included B1800 blocking filter features an 18mm aperture and is housed in a 1.25" diagonal, providing both safety and optimal performance by blocking unwanted wavelengths and ensuring a well-illuminated field for both eyepieces and cameras. The etalon filter delivers a narrow bandpass of less than 0.7 Angstrom, allowing for detailed views of solar surface features and prominences. The system comes with a carry case for secure storage and transport.

The B1800 blocking filter is a required safety component for all Lunt H-alpha systems and is designed to match the focal length and application of your telescope. For visual use, it is suitable for telescopes up to 1800mm focal length, while for imaging, it is recommended for telescopes up to 1200mm focal length to ensure full sensor illumination and optimal performance. Always use the blocking filter in combination with a Lunt H-alpha filter or telescope for safe solar observation.

Specifications

Capacity

• Half-value width (bandpass): 0.7 Angstrom

• Connection to telescope: 1.25"

Equipment

• Carry case: Yes

• Other contents: B1800 blocking filter with 18mm aperture (in 1.25" diagonal)

General

• Weight: 850 g

• Type: Solar filter

• Type of build: Line filter