Delivers a plane-parallel, achromatic beam of 36 mm
diameter and 4 times the telescopic stroke width;
First and foremost, designed for H-alpha and CaK subangstroem etalons;
Does a 1/2 include? Socket for the 2 nm block filter of the Baader
SunDancer II H-alpha Filter;
Can be used in place of a Barlow lens;
BBAR coating (BBAR = Broad-Band Anti-Reflection);
Anti-reflective threads and blackened lens edges against reflections and for
maximum contrast;
Image circle 36 mm, nominal at a distance of 97 mm from the T-2 threaded bottom;
11/4″ and 2″ plug-in connection with 11/4″ filter thread, camera side T-2
Thread;
Includes 1/2″ (12.5 mm) filter wrench;
5-year warranty if handled properly;