Lunt - 75mm Ha Etalon-Filter-System with B1800 blocking filter for 1.25 "

Introducing the LS75 Hydrogen-alpha system. To kick off the new company we are offering the 75mm aperture (no central obstruction) 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 length. Larger blocking filters suitable for longer focal length telescopes are also available options. Because the LS75 has an estimated bandpass of <0.75 Angstroms it is capable to providing high contrast views of both surface and edge detail. Adding an additional etalon system will reduce the bandpass to ~<0.55 (dependant upon scope) allowing for higher resolution viewing and/or imaging. Delivered with order: • Main Filter • Blocking Filter (for 1.25 inch eyepiece-holder) • Transport case