T2 Rings

T2 rings, often called T-rings, attach your camera body to telescopes and astrophotography accessories using standardized threads. Each ring is specific to a camera mount, such as Canon EF or Nikon F, and connects to a T-adapter, field flattener or focal reducer to complete your imaging train.

Explore Scientific offers both T2 (M42) rings and larger M48 camera rings. The wider M48 thread provides a larger clear aperture, which helps reduce vignetting, or darkened corners, when using full-frame or larger APS-C sensors. A quality camera ring holds your camera securely and square to the optical axis, which is essential for sharp stars and consistent focus. If you are starting in DSLR or mirrorless astrophotography, the correct T-ring is one of the first accessories you will need.

To choose the right ring, identify your camera's lens mount and whether your imaging train uses M42 (T2) or M48 threads. Many field flatteners and focal reducers designed for astrophotography use M48 threads to maximize illumination across the sensor. Combined with the right spacers and adapters, a T-ring lets you achieve the precise back focus needed for round stars in the corners. Explore Scientific T2 and M48 rings are a simple, essential part of capturing the Moon, planets and deep-sky objects with your camera.