This T-Mount to Canon EF Adapter mounts to your Celestron NexStar 6SE 150mm f/10 Telescope to view and capture the outer world with a Canon EF-Mount camera, like the Canon 5D Mark IV. The T-Mount adapter threads to the telescope while a pre-attached Canon EF T-Ring clicks right onto your camera like a lens. Please note that it is only recommended to use DSLR or Mirrorless cameras with the T-Ring, as cinema cameras will be too large to attach to the telescope.