depens on what newt it is and where the focal point of the newt is. I know for a fact that a cannon eos 350d comes to focus with the skywatcher equipment in a 8" and 10" skywatcher scope, easiest way though is to crack out the ruler and measure or try and get focus.
the other good thing with your 120mm newt you can turn it into a guide scope later down the track. this is exactly what i have done. My old blue 114mm dick smith scope i rebuilt with some hardware that i brought off the forum it now sits proudly up on the back of the 10"er on the eq6 and does a wonderful job of spotting guide stars with the meade DSI.
so as soon as i get a Digital SLR I will be ready to go!!!
In the eq6 box when you buy it comes a standard dovetail bar, you should be able to mount this directly to the rings of your 120mm newt (assuming you have it on a GEM already) if not you can purchase rings that will suite the outer diameter of your telescope without to much hassel at all.
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