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To use a camera in a newtonian, you will need to do one of three things...
Some Newts only a low profile focuser to come to focus, if this is the case, then its a very nice and easy job, and you'll more than likely want a new focuser anyway for imaging, so its two birds with one stone...
Other newts, you can put larger collimation bolts/springs in it, which push the primary mirror 1~2cm further up the tube towards the secondary... This is again a fairly simple task..
The third and final option is somewhat more daunting, for me anyway. but alot of forum members have done it, and had great results... It involves removing the primary mirror cell, and cutting 50mm off the bottom of the the tube, then refitting the mirror cell...
There is a forum member 'Peter_4059' who has a 10" skywatcher Newt on an EQ6, with an ED80 for guiding... He uses 4 counterweights, which is quite alot, but judging by the quality of the images he takes, I'd say its chuging along just fine with the weight...
You mentioned collimation in your last post, but I think you may have the word confused a little bit... collimation is a process every newtonian owner will be required to master if they wish to get the best from their scope... It is the process one goes through in order to allign the mirrors with each other, and to the focuser.. if they are mis-alligned, the focal plane at the cameras chip will be slightly off flat, causing some of the image to appear focused, and some to be slightly out of focus. It is quite simple to do once you get the hang of it... There are plenty of guides on these forums...
Personally, I think if you went for the 10" newt + ED80, you'd have all bases covered...
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