You can put a DSLR on a scope but we highly discourage it.  You will notice that all the top digiscopers use mirrorless cameras.  

DSLR’s have 5 main disadvantages

1.  Very heavy and hard to keep the scope balanced with the camera on and off due to the weight change.
2.  Mirror slap at such high magnifications requires faster shutter speeds and higher ISO
3.  Larger sensors require more light that scopes don’t deliver well. Again, higher ISO
4.  Requires manual focusing and the viewfinder of a DSLR is not great for fine focusing.
5.  Hanging all that weight on an eyepiece is hazardous to your scope. (except Swarovski X series)

Using adapters that require you to abandon your lens and use a T2 mount is even more troublesome since you have to scope through the camera rather than easily removing it and you risk dirt intrusion into the camera.  

You would be far better off (in our opinion) to use a mirrorless or Point and Shoot camera

In the end, the advantages that seem great on a DSLR are quickly diminished and using them typically results in a lot of frustration for digiscoping.

Being aware of the above information, if you still wish to use a DSLR, please first take a look at
WILL MY CAMERA WORK and there are some dimensional restrictions located at the bottom of the page.  Some aftermarket DSLR lenses will fit in the ”B” dimension.

Once you have determined that dimensionally your DSLR will work, make sure you watch the video on the same page.

For Swarovski X series owners, DIGIDAPTER™ offers the
DLM (direct lens mount) but we still recommend mirrorless cameras.

Again, we highly discourage a DSLR for digiscoping but we are happy to help you if you still choose this method.