I started this project for a double refractor with two Borg 125mm ED APO refractors with 800mm focal length. After a long search these telescopes in my eyes are the best solution regarding big aperture, low focal length, low weight and high optical quality
Here I am at my lathe cutting a peice of bronze to become the vertical bearing of my mount.
Here you can see the inner and outer bearing
The dovetail clamp is adapted to the inner bearing
To save some weight I added some more holes
Here I am measuring the axial play of the bearing
The readily mounted dovetail clamp together with the inner and outer bearing
I am milling the holder for the outer bearing at my round table
And it fits well :-)
Inner bearing, outer bearing and holder
Now with attached dovetail clamp
The vertical bearing is ready, here you can see how the odvetail rails are attached
The horizontal bearing is also machined out of bronze
Here you can see it attached to a tripod
And this is the complete mount.|
It is a copy of the central mount developped by Tatsuro Matsumoto, which I have built with his permission
The advantage of this mount is it's extremely low weight and the ability to mount the telescope tubes in their center of gravity To attach the very thin aluminium tubes to the dovetail rails I needed some extra support.
I am starting with two rings out of aluminium having the inside diameter of the tubes The rings are cut into pieces And these pieces are milled down to lokk like little moons drilled and countersunk To save space even the countersunk bolts needed to be turned down This is how my solution is looking like
A piece of tube mounted to the prism rail using the support pieces And here with the real tubes I covered all shiny parts with black velours to prevent reflections. These are the two Matsumoto EMS-UXL systems with helical focusers between the mirror cases for adjusting the interpupillary distance Here the EMS units are mounted to the tubes which are attached to the mount. This is the finished binoscope The weight of one tube with EMS is 4 Kilogramm.
The complete weight of the binoscope with mount is 12 Kilogramm. Observing near the horizon... And towards the zenit The binoscope fits well into an old Rimowa Aluminium case The accessories as well as my two Canon IS binoculars are inside another, smaller Rimowa case Ready to travel to dark places :-)