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This very high quality 1.25" extension tube can be used to provide an additional 25.4mm (1") of extension in cases where you need a little bit of additional back-focus travel.
Eyepieces in which the lower 1.25" barrel is shorter than 1" will seat completely within the adapter. Eyepieces with longer barrels will stick out a bit, increasing the extension provided by this same amount.
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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