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20mm long adapter from female M48x0.75 to male M48x0.75 threads. This can be useful to get 55mm backfocus with a ZWO cooled camera (17.5mm) and Starizona Modular Filter Slider (17.5mm). Ideal for that setup on anything with a 55mm backfocus and M48 threads such as common field flatteners, Celestron RASA 11" and more.