Maybe you should point out which end attaches to the camera📷☺️.
The shiny side connects to the camera, the other side points at the subject.
Make sure you set the aperture to f22 or the camera will give you a fEE error.
I don't know, polished glass is pretty shiney.
I looked at my manual and it didn't say what that error was. The manual is pretty thick only because it is written in every language known, including ancient greek and elfish. It has the usual precautions that most products have such as: Don't use in the shower or bathtub. Use extreme caution while standing in a pool of gasoline. Don't use your wet hands on the lens(which will probably make this lens less than suitable for home porn projects). My favorite is don't pee on an electric fence. It also has specs and what cameras it can be used on. Not much on how to mount it or usage, except for what the M/A switch is for. Good luck in your quest to find out what that error is.