Most scopes have a large[ approx. 25mm diam .] knurled hand tightened
wheel that you tighten up against the bottom of the camera whilst aiming the camera where you want it to point.[ which may not be the same direction that the scope is pointing.] If the wheel is missing or not supplied, you can always use a conventional nut and a small spanner
to nip it up temporarily. The thread is strong enough for any DSLR once the wheel or nut is nipped up. I use mine with a large telephoto lens on it.
raymo
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