Many telephoto lenses and telescope adapters have the T2 connection thread (M42x0.75). With this T2 ring you can connect all Pentax SLR cameras with the K bayonet to the T2 thread.
The T2 ring has the T2 thread as an internal thread and has the bayonet connection for the Pentax K and Sigma camera bodies.
Three grub screws allow the camera to rotate.
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