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It helps to get focus when there is no diagonal in the optical train Lee. A diagonal adds a considerable distance to the length of a scope and without it you may not get to focus (certainly won't using an eyepiece). The extra long draw tube helps to over come that problem. The thing to remember though is that the further away from the focuser your camera gets the greater the lever arm moment is on the focuser/drawtube assembley. You need to make sure there is a good strong connection between these two elements so you don't get sagging and slop with the weight of the camera attached.
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