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Product Feature: pls note that this auction is for one pc,pls choose which size you need,so we can ..

1.25" Filter thread extension tube and barrel 20mm 25mm for telescopes Product Feature: This adap..

Product Feature: Connect all those DSLR camera T-rings (with M42x0.75mm thread) to telescopes. Buil..

New M52 to M42 Focusing Helicoid Ring 17-31mm 25-55mm 36 - 90mm Macro Extension Tube w/ Copper Core ..

New M58 to M58 Focusing Helicoid Ring 36 - 90mm Macro Extension Tube  Product Feature: This t..

New M65 Macro Extension Tube Focusing Helicoid Ring 25 - 55mm W/ Copper core Product Feature This ..

New M65 to M65 Focusing Helicoid Ring 17- 31mm Macro Extension Tube Product Feature: This tube use..

New 7mm S mount MTV Lens Extension tube Adapter Ring for M12X0.5 Board Lens 7mm and 10mm   ..

Product Feature: Male thread m42*0.75 at the base end  female thread m42*0.75 at the other en..

Parfocal Length Extenders for Microscope Objectives RMS thread Extension Ring Product Feature: Inc..

~Parfocal Length Extenders Microscope Objectives M26 X0.7 Extension Ring 16mm    ..