Male thread - M48X0.75; Female thread - M48X0.75; eliminates a range of focusing problems
The extension tube has a M48X0.75 interior thread and a M48X0.75 exterior thread for elegantly solving spacing problems in astrophotography
Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners
Fits in 2 inch telescope focusers and accepts 2 inch eyepieces or accessories; threaded for use with standand 2-Inch astrophotography filters
Features two locking thumbscrews to secure any inserted astronomy accessory; with a brass compression insh to prevent the marring of your telescope accessories