Male thread: M42x0.75; Female thread: M42x0.75; Eliminates a range of focusing problems
Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners
The extension tube has a T2 interior thread and a T2 exterior thread for elegantly solving spacing problems in astrophotography
Compatible Cameras: Fits a wide range of Nikon EOS SLR/DSLR cameras; including Nikon D1 D40 D50 D70 D70S D80 D200 and all digital NIkon cameras with an F-bayonet
Telescope Adapter: One end of the T2 T Ring is M42 female threaded and the other is Nikon F-Mount; you can attach your camera freely to a 1.25 inch or 2 inch focuser of telescope by using a appropriate T-Adapter which is not include