100mm Ha Etalon Filter with B1800 for 1.25" Focuser - LS100FHa1/B1800 Eyepiece Extension the required gap becomes a

the required gap becomes a problem

A time honored remedy has always been to simply pull the eyepiece out of the focuser as far as it will go

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

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

100mm Ha Etalon Filter with B1800 for 1.25" Focuser - LS100FHa1/B1800 Eyepiece Extension the required gap becomes aAbout 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