Mamiya Sekor C 140mm f/4.5 Macro - Mamiya RB67 Mount

Designed for the RB67 system, the Sekor C 140mm f/4.5 Macro is a dedicated close-up lens capable of 1:1 magnification when used with extension tubes. It incorporates a Floating Element System (ULES) to maintain sharpness across the focus range, from infinity to its minimum focusing distance. It is highly regarded for its flat field and lack of distortion, making it a standard choice for product and scientific work. The ULES ring is a critical point of inspection; SDS ensures the floating element adjustment moves freely and correctly correlates with the bellows extension. We test the Seiko leaf shutter for timing accuracy across all speeds. The large rear element should be inspected for scratches, and we check the aperture linkage for responsiveness and lack of oil contamination.