DOCUMENTED REPAIR · HOSTOPHOTO

Oil inside a Mamiya Sekor 100mm f/2.8

Oil contamination inside a lens can affect aperture behavior and optical cleanliness.

Oil inside a lens is rarely harmless. It can migrate, slow aperture blades and leave traces on nearby optical surfaces.This Mamiya Sekor 100mm f/2.8 required disassembly and cleaning of the affected areas, followed by a check of the diaphragm action.The important point is to remove the cause, not only wipe the visible trace.