2" Quartz Dielectric Star Diagonal (D1040Q)

Description This is the most advanced version of our most popular diagonal. It was designed by Vic Maris and uses a thick, over-sized mirror polished to 1/10th wave. The mirror has a protective, dielectric coating with 99% reflectivity. It has a compression ring eyepiece tube and the insert tube has a bevel that will better seat the diagonal in the focuser. The FA2 deluxe 1.25" compression ring adapter is included. Both the two inch insert tube and adapter have filter threads. A rubber grip on the 2" tube allows for easy handling in cold climates. The 2" female insert tube on this diagonal will accept 41mm or 1.61" of nose piece length before hitting the built in safety stop.  If your 2" nose piece is longer than this specified distance, the nose piece will not fully insert, though this is rarely an issue.  The D1040Q adds 4.1" or 104mm to the optical path.  These diagonals are assembled, adjusted and double tested at Stellarvue for perfect alignment and performance. The five point cus