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Josh recently made for me a custom adapter to fit between my Esprit 120 field flattener and the ZWO OAG. The stock adapter that ships with the telescope adds 20mm of backfocus but the male M48 thread on the camera side is very deep - too deep to actually fit into the OAG. It strikes the OAG stalk and sticks out, both adding extra backfocus and causing tilt. I asked Josh if he could make an identical adapter but with a shallower M48 thread. It is a perfect fit, the OAG now screws properly into my imaging train without anything striking the stalk, and although I haven't had a chance to get out an image with it yet by the look of how it fits together I am not anticipating any issues.
Quality of the adapter is excellent, highly recommended!
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