An adapter to connect a DSLR camera with EF-S style adapter, like the one used by Canon, to connect to a 1.25in telescope eyepiece for astrophotography. Note that you may need a barlow lens or another part to be able to rack focus for the camera, depending on your camera and telescope. I recommend matte black PLA if you have it, otherwise any dark PLA should work well enough. The fit between the camera and the adapter should be decent, the fit between the adapter and the eyepiece should be snug but not super tight.