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Hi John
For prime focus work, I use an adapter that mates the DSLR with the 2” focuser tube where the eyepiece normally fits.
Basically you remove the camera lens from the DSLR and mate the T2 end of the adapter with the bayonet mount of the camera, then slide the 2” end into the focus tube, tighten the thumbscrew and voila, your 18” F4.5 ‘scope is now a super telephoto lens just over 2000mm in focal length!
Here are a couple of photo’s with my old 35mm film camera, showing how the SLR is connected to the focus tube on the Vixen 4" refractor.
Cheers
Dennis
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