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I've used a combination of an Explore Scientific 2" dia. 2x tel-extender plus an 80 mm. extension tube at the end of 112 mm. of draw tube of my ES 127 mm., f/7.5 refractor to capture images with a Canon T1i. I use this combination satisfactorily for imaging almost all deep sky objects, but planets need to be larger on the camera's sensor. For that reason, I bought a 1-1/4" dia. ES 3x tel-extender. Unfortunately, that 3x tel-extender required 251 mm. of extension tubes beyond the end of a 103 mm. of draw tube in order to bring the object to focus. Adding all components together, including the 3x tel-extender itself, I had 421 mm. (16.57 inches) of stuff hanging off the rear of the scope's main tube, NOT including the camera body and its 1-1/4" dia. nose-piece! Does this arrangement sound reasonable? If I had to do a fast slew to an object with all that weight hanging onto the rear of the scope, I'm afraid there'd be whiplash damage ! How do you folks handle Barlows and tel-extenders of 3x and greater power? Bob Z.