Adjustable 2 "diameter extension from male M48 to female M48, with a sliding counter ring. Total length 16 mm, travel range 13 mm. Element particularly useful in setting the right distance for astrophotographic elements (flatteners, OAG, field correctors, etc.). • overall length: 16 mm • material: metal • threads: male M48 (2 "filter thread) / female M48 • producer: GSO, Taiwan


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