We purchased the nauticam cmc-2 for my wife and simply put, she didn’t like it. She tried it out a time or two and it’s been sitting on the shelf ever since. We also have the bayonet adaptor and bayonet mount for it. No scratches or wear of any kind. I can email photos on request. (Working off my iPad and images are to large to upload here). $300 shipped - USA.
https://www.nauticam.com/products/compact-macro-convertor-2-cmc-2-2-8x-magnification
