Custom 1.2x Magnifying Eg Eye Cup for Canon EOS 7D Mk II 5D Mk III 5D Mk IV 1D
EOS 7D Mk II. EOS 5D Mk IV. EOS 5D Mk III. It's a Nikon DK-17M 1.2x magnification eyepiece lens fitted to a modified Canon Eg Eye Cup. So I bought an Eg eye cup and modified it so I could screw the Nikon DK-17M eyepiece into it.