I found this made in USA mount system for DSLRs. They also make what looks like the best commercial smartphone adapter. Aluminum body and machined far as I could tell.
https://novagrade.com
I ordered the DSLR for my spotting scope. B&H Photo has the full line. I didnt check AmZon.
https://novagrade.com
I ordered the DSLR for my spotting scope. B&H Photo has the full line. I didnt check AmZon.