In looking over various configuration options, I ran into a TS-optics 1.6 ( or 2.6 ) GPC.
Maybe it is the German to English translation, but their descriptions say the GPC reduces the light path of the binoviewer by 65 % or maybe to 65 mm. And their 2.6x eliminates the length completely.
I always thought these devices by pushing the focal plane outwards - acting as a barlow.
What am I missing ?
john