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There are some focusers available that are 'low profile' which allows sufficient in movement to focus a DSLR - the other way is to either move the mirror up the tube a little or to put a x2 barlow into the focuser before the DSLR.
I think moving the mirror might be the long term way to go.
If you know the distance from the camera sensor now to the sensor with the focuser in place, moving the mirror up that much would give you just enough to focus the camera, if you add a few mil then you'll be able to assure yourself that other cameras will also fit - conversely how much travel have you got on your collimation screws????? Will that move the mirror up without extra drill holes??
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