Lunt Solar Systems Filters LS 50F Ha H-Alpha filter set for 3400mm focal length (12690)

This system comes equipped with the B3400 blocking filter, making it suitable for use with telescopes that have a focal length of up to 3060mm. The blocking filter is housed in a straight extension tube designed for a 2" focuser, which includes fittings for both 2" and 1.25" eyepieces. If you want to achieve even narrower bandwidth and higher contrast, you can add a Double-Stack etalon system to reduce the bandwidth to less than 0.55 Angstrom. This setup is ideal for detailed and safe solar observation.