This adapter allows using C-mount cameras on telescopes It can be used with T-mount lenses as well; but in macro mode only; infinity focus will NOT be possible Made of anodized aluminium This is a very high quality anodized extension ring The spacing required can be achieved by combining several extenders of differing lengths T mount (M42*0.75 pitch female) TO C-MOUNT(Male 1"x32TPI) adapter this adapter used for various cameras attached to a Microscope photo tube, or telescope with a T-mount (M42 x 0.75 metric thread). It can easily convert T2 mount port or T2 mount microscope trinocular phototube to C-mount type. You can then mount C-mount threaded cameras on top of this adapter.