DOCUMENTED REPAIR · HOSTOPHOTO

A fungus-filled Mamiya Sekor C 300mm f/5.6

A medium-format telephoto lens with heavy fungus contamination and a long, careful optical cleaning job.

Large medium-format lenses can hide a surprising amount of contamination. This Mamiya Sekor C 300mm f/5.6 needed a full optical inspection before deciding whether cleaning was worthwhile.The lens groups were opened one by one, cleaned and checked for coating damage. With fungus, the goal is to remove the active contamination while being honest about permanent marks.When the structure is sound, this kind of lens is usually worth saving.