Plastic will also always be superior to metal in weight, and functionality is all over the map: good lens (for ones purpose) dwarfs enclosure material for that.

Plastic will also always be superior to metal in weight, and functionality is all over the map: good lens (for ones purpose) dwarfs enclosure material for that. It wouldn't be hard to pair you with someone mad at their old-school lens for helicoid play who has no complaints about their plastic. Especially in the last decade, it's not a useful filter, just one of many factors to consider in selecting gear.