Off axis guider question

This should be an easy question for the astrophoto gurus in this forum: will an off axis guider for a newtonian require additional focuser inward travel? Presently, when in prime focus I have about 1/2" of inward travel left, however as most OAGs are double this length, I wouldn't be able to achieve focus. I am also curious as to whether OAG designed for SCTs (without focal reducer) could be used on a newtonian. My focuser tube has a male T-thread which I believe could fasten securely to a female threaded OAG (assuming they exist). I'm getting great results with my digital Rebel, and I'd like to graduate to longer duration photography. I have no delusions of grandeur however, as my CQ5 clone mount isn't exactly the best mount for this purpose. Thanks!
Sean Prange

only option is a lumicon Newtonian easy guider, and that may still leave you with not enough in travel. you will most likely have to get a lower profile focuser (my guess is that if you can focus a camera already, your focuser profile is probably as low as it can go); or you will have to move the primary cell forward in the tube. This of course will require a larger secondary, if you don't want more vignetting.

http://www.lumicon.com/egnewt2.htm