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M23.2 and M27.5 Fixed Extension Tubes are ideal for covering portions of the cage system. Each fixed extension tube is designed to fit within the inner diameter of a cage system plate, and feature either M23.2 x 0.75 or M27.5 x 0.75 female threading throughout the entire length of the tube. Retaining ring pairs can be used to secure optics within the extension tube, while adjustable length tubes and thread adapters can be used to connect fixed extension tubes for building customized optical assemblies.
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