●【For F Mount Cameras】 Compatible with Nikon F mount cameras, including D850 D750 D500 D780 D7500 D5600 D3500 D5, 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