Mamiya 120mm f/4 Macro Lens for 645AF: Manual Focus Dual Helicals
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Servicing a Mamiya 120mm f/4 Macro Lens for 645AF. Although this lens is made for the Mamiya 645AF, it is a manual focus lens. This is due to the very long focus helix. Actually, the lens is a bit complex as it has two helicals.
While it has the same bayonet mount as the manual focus Mamiya 645 lenses, it will not attach to a non AF body due to the construction of the rear lens barrel.
