1、25‑inch diameter T‑adapter, suitable for all standard 25‑inch telescopes and microscopes. 2、For T2 T‑Ring adapter, allows for Sony and for Minolta AF mount camera to the telescope, camera adapter and other astrophotography accessories. 3、The extension tube is suitable for all standard 25‑inch telescopes and microscopes. 4、Usage, screw the T‑adapter into the T‑ring adapter, then screw the entire mounting adapter into the camera and connect the telescope/microscope. 5、The ring adapter cannot auto focusing, the adapter ring is not electrically connected, you need to manually set the aperture and focusing. 1 x Extension Tube1 x Adapter ring Condition: 100% brand newItem type:  1.25 in Extension Tube SetMaterial: AlloyColor: blackWeight: Approx. 158g Interface: 1.25 inches, for T2, M42x 0.75mm, for AFApplicable telescope: for T2 telescopeApplicable camera: for Sony and for Minolta AF mount camera