The native back focus for this reducer/flattener when used with our SVX140T is 68 mm from the rear of the M69X1 attachment thread.
Weight is 3lb 1oz.
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This works great!! I am doing some imaging now and it is giving me a totally flat field at 660mm and pinpoint stars across the entire imager! QHY163M. Great quality, I will be looking at getting a StellarVue Scope next!