Check the listing for details. NEEWER T Ring with M42 Threads for 35mm Canon EOS for EOS-1V 1N 5D Mark IV 6D. Condition: New. Listed at 11.95 USD. NEEWER T Ring with M42 Threads Compatible with 35mm Canon EOS Cameras & Telescopes, Lens Adapter Ring for EOS-1V 1N 5D Mark IV 6D Mark II 80D 70D 800D 750D 300 Rebel GII etc, LA-02 Brand: NEEWER Item Condition: New ====Product description ==== For 35mm EOS Cameras Compatible with 35mm Canon EOS cameras, including EOS-1V 1N 5D Mark IV 6D Mark II 80D 70D 800D 750D 300 Rebel GII, etc. This T ring can connect your A mount camera to a telescope for professional astronomy photography Secure Attachment Mount the T ring on your camera via the bayonet flange and secure it in place like a lens Wide Compatibility The other side with standard M42 x 0.75 threads suits various telescope eyepieces and accessories Durable Metal Build Solid black anodized aluminum alloy with matte interiors prevent reflections and lens flare from spoiling your shots Effortless Operation Straight grooves make it easy to screw and unscrew the T ring. The T ring does not have electrical contacts, so you need to focus and adjust the aperture manually