Pentax Cable Switch A (long) lens mount_Contax G This padded case is either

This padded case is either a camera bag or a novelty cooler

but the plate can be installed without the extension tube & hook with the addition of a 3/8" nut (not included)

with only minor dust and some light micro abrasions on the front element

and they’re still around today

The DR-6 rotates 360 degrees and has switchable 1x/2x magnification for more precise focusing

Pentax Cable Switch A (long) lens mount_Contax G This padded case is eitherThe Pentax Cable Switch A is a remote release cable for the 645N and others that use the same round 3 pin connector (pictured). This long version has a cable that extends approximately 3m.