100mm Ha Etalon Filter with B1800 for 1.25" Focuser - LS100FHa1/B1800 Eyepiece Extension From our Moon’s chiseled craters

From our Moon’s chiseled craters to Jupiter’s orderly cloud belts to the blue-white stars of the Orion Nebula popping against the complex misty cloud they call home

or your 2" eyepiece or barreled accessory

Slide Type: 1" x 3" (25 mm x 76 mm)

the required gap becomes a problem

It combines 50mm of aperture with Lunt''s innovative pressure tuning system

100mm Ha Etalon Filter with B1800 for 1.25" Focuser - LS100FHa1/B1800 Eyepiece Extension From our Moon’s chiseled cratersAbout the Lunt 100mm Ha Etalon Filter w B1800 for 1. 25" Focuser This product number is for the Lunt H alpha Single Pass Front Mount Etalon System for telescopes with 1. 25" focuser and up to 1620mm focal length. Introducing the Lunt LS100 Hydrogen alpha System a 100mm aperture integrally tuned etalon for use on any customer supplied refractor. System includes the B1800 blocking filter which provides full disk images on telescopes up to 1620mm focal