2" telescope camera mount adapter extension tube M42x0.75mm, sutitable for Nikon Canon Sony DSLR camera universal. 2" Diameter T Adapter:suitable for standard 2" telescope and microscope. M42x0.75mm Threads:connect the T-ring mount and T-Mount,fits for M48*1 filters and M42*0.75 cameras. Put the telescope eyepiece into extended tude, screw t adapter and t ring adapter, then attach camera to telescope. It has a slope design on the bottom to prevent camera from falling when the mounting screw is loose.