Extension tube provides extra focuser back travel often needed for short-range terrestrial viewing through a telescope or for astrophotographic applications Adds 2 of extension fits in 2 telescope focusers and accepts 2 eyepieces or accessories Features two locking thumbscrews to secure any inserted astronomy accessory Threaded for use with 2 Orion eyepiece and astrophotography filters Machined and anodized aluminum tube
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