I enjoy using my Celestron 80mm wide view #52260 scope. If I found another one, could I fasten them together as makeshift binoculars? Would I be able to position the diagonals for comfortable viewing?
Or is this a bad idea?
In theory, yes. In practice this would be a very challenging thing to do.
The reason is that to get the far apart enough to have the necessary inter pupilary distance would require a lot of light path.
By the time you got the scopes far enough apart and hold them in position, you would have to have some kind of dual, collimatable or you would need to use a collimatable binoscope conversion. Now the problem with this is that this much light path most likely would require that the tube be cut shorter, and this means that the front of the focuser tube may push into the light cone reducing the aperture of the scope.. The solution to that is to use a focuser with a bigger tube (and you would need two) or cut the tubes shorter (which limits your focuser travel).
Then you have to worry about how to adjust IPD. Now if it is just you, then you can build your cradle to fit your eyes, but now you have to have collimation in the cradle or in the mirrors.
There are a couple of people that sell the necessary stuff to avoid some of these problems. With the EMS BinoBack you don't have to worry so much about the cradle because the IPD and the collimation are done via the EMS binoback.
Here is the Binoback...
So, not saying it could not be done, but it is a lot of engineering and not as simply as it sounds. If you take a look at the binoback page it will kind of help you understand the challenges involved.
Dave Trott's binocular telescope uses small, slow refractors and at first was straight through, which would not make them comfortable to use, and in that case, you might as well buy a binocular. As he refined it, the solution started to look a lot like the EMS. Dave goes through his learning experience though, so the page is a good read.
Edited by Eddgie, 18 May 2020 - 08:28 AM.