Male thread - M42X0.75; Female thread - M42X0.75; eliminates a range of focusing problems
The extension tube has a T2 interior thread and a T2 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
T ring for Pentax-K SLR/DSLR: Compatible with Pentax-K SLR/DSLR Camera with 42mm Pentax K bayonet (Please Attention); including Camera K-x K-r K-01 K-30 K20D K200D K2000 K1000 etc; Equipped with one hex wrench that achieve camera's easy angle adjustment
Quick & Convenient Installation: Just clockwise tighten T2/T ring to Pentax-K DSLR/SLR Camera via camera connecting thread after aligning camera lense bayonet; Other end connect with telescope accessories includes M42x0.75 Male Thread like T Adapter