Astronomical T2 thread Extension Tube ---Astronomical T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography. ---Applied to telescopes for astronomical photography of the mysterious universe. Connect different attachment for different usage. Link or extend tube length of the M42*0.75 Products. Fully Metal Construction All metal solid construction and anodizing aluminium process that makes the extension tube be used for long time. Lightweight Lightweight and will not be a load for your telescope. Great quality material, compact enough to keep in your telescope accessory bag. Buyers show These extension tubes screw right onto the celestron T adapter that fits onto the .7 focal reducer. Nicely machined, very happy now that I've achieved 105 mm of backfocus. Great value. Also my new ZWO ASI 294 screwed right onto the T adapter.

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