12mm extension tubes have their purpose!
I will not pollute this forum with them, but for macro fanatics as well as straight razor fanatics, just so you know, we straight razor shavers like our 'shave of the day' pictures. The D850 and a macro lens with an extension tube allows me to post to straight razor forums some unusual pictures. An old, NLA (no longer available) Thiers Issard straight, an old Somerset era Simpson brush, and even some old Penhaligon's cologne (NLA given the wretched EU regulations about scents), and unshown is the best shaving soap I own, but I make it myself. A little chemistry knowledge allows much to be made without the restrictions and daftness of regulations. If you can develop film you can make soap!