XCSOURCE Telescope Camera Adapter 1.25" Extension Tube T Ring for EOS Metal DC618 These adapters allow you to attach your EOS camera to the telescope with standard 1.25 inch Eyepiece Ports Prime Focus Photography - Use direct with your camera. Eyepiece Projection - Use your eyepiece in extension tube. Extended Barlow Projection - Use extension tube with your barlow (Extended barlow projection makes a 2x barlow into a 3x or more barlow). High Quality and Brand New