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The telescope is effectively a long focal length lens. I have only ever used a T2 adapter and T-ring with no spacers for prime focus. The focal/film plane is indicated on the camera (circle with line through it).
Your only issue may be if the focuser has enough inward travel to allow the film plane to match the focal plane of the telescope at prime focus. If not you can try pushing the mirror forward by adjusting the collimation bolts. If still no then you need a low profile focuser or one that has two upper bodies, one for visual (removeable) and one for photo (replaces visual). I have one of these from 35+ years ago, I think Tectron brand.
To avoid image shake use a black cloth at the front of the aperture then use cable release to start exposure then slowly uncover the aperture trying not to bump the telescope. Activating the shutter can cause vibration during mirror flip and you want to avoid this. Cover the telescope then release the shutter at the end of the exposure.
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