Used Camera Lenses

Rodenstock Apo-Gerogon 1:9 f=300mm adaptor / filter
Rodenstock Apo-Gerogon 1:9 f=300mm adaptor / filter

I honestly have no idea what this is.  Title is what is listed on the item.  It clearly screws into a lens or camera.   926521

$ 49.90 Add to cart
ECF-124 6 pin F (Lens) to 12 pin M (Camera) Adapter Cable
ECF-124 6 pin F (Lens) to 12 pin M (Camera) Adapter Cable
ECF-124 6 pin F (Lens) to 12 pin M (Camera) Adapter Cable
$ 29.90 Add to cart
40″ Focus control cable
40″ Focus control cable
For lens control
$ 19.90 Add to cart