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8 PCS M48X0.75 Focal Length Extension Tube Kit 3 5 7 10 12 15 20 30mm Extending Ring for Astronomical Telescope Photography Astronomical Extension Tube Kit
Variable combination-: The required spacing can be achieved by combining multiple extension rings of different lengths. You can use 1, 2, 3 or 8 extension rings as required.
Type: Astronomic telescope M48 threaded extension tube, the height of the extension tube is 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm and 30mm.The required spacing can be achieved by combining s al extension rings of different lengths, you can use 1, 2, 3 or 8 extension rings as required.
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