Mamiya 6 75mm f/3.5 L Lens: Loose Focus Ring and Helix Guides
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Servicing a Mamiya 75mm f/3.5 L lens for Mamiya 6. Focus ring was loose so the lens was no longer able to focus properly. After tightening the focus adjusting screws, focus was tight and grinding. I removed the focus ring, cleaned out some residue underneath the ring and also removed, cleaned and adjusted the focus helix guides in the rear of the lens. All is now well.
The last photo shows the lens on a special fixture that is necessary to adjust focus on this lens as the Mamiya 6/7 lenses have a normally closed leaf shutter so it must be electrically opened for focus adjustments.
