Adapter Ring with M42 Female Threads and M58 Male Threads
This aluminum adapter ring has M42 female Threads on one side
and M58 male threads on the other side. The M42 threads fit
T-thread male adapters and the M58 side fits M58 female threads,
like on the WO Focal Reducer/Field Flattener.
As with all fine-thread adapters, use a safety lanyard on your
prized camera, as they make a terrible sound when they hit
Price includes shipping in the USA!