T-Rings, Spacers & Thread Adapters

Adapts Optec DSI 3.5"x24tpi male threads to M72x1 male threads Maintains a wide 65.0mm (2.56 in) clear aperture Consumes only 3.8mm (0.15 in) of b...

Five-piece set with 1/2, 3/4, 1, 1-1/2, and 3-inch lengths Creates any spacing from 0.5 to 6.25 inches in 1/4-inch steps Total combined extension ...

Connects OPTEC-4300 dovetail to DSI 3.5" female thread Designed for the Optec Gemini Focusing Rotator Consumes only 2.5 mm (0.1 in) of back-focus ...