I am wanting to know if there is such a thing as a "grayscale lens filter" for either vintage or new camera lenses so when you look through them everything is in gradations of grey and not color? If so, please elaborate on what the proper name is for them and what they are used for, how they are used, who makes or made them, what kind of glass they are made out of and any other information or details about them would be appreciated.
Thank you
Thank you