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This very high quality 1.25" extension tube can be used to provide an additional 23mm (0.90") of extension in cases where you need a little bit of additional back-focus travel. Overall tube length is 50mm (1.97"). Made of black anodized aluminum. Includes a brass compression ring that prevents marring of your eyepiece barrel by the metal set-screw. Threaded to accept standard 1.25" filters.
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