Quote: Measuring both with an internal caliper I found the internal diameter on the dialectric to be 1", the older Vixen unit was 1:1/8" allowing more light to reach the mirror, any thoughts and comments on this are welcome, seems to me its similar to stopping down a lens?,thanks ,DA.
6"f15 D&G, 6"f5 Jaegers.
TSA 102, TV60.
Docter 15x60, 10x50.
10" OO VX, 6" iOptron Mak-Cass, Orion 100ED