For sale is a vintage Mamiya-Sekor Shift C 50mm f/4 perspective control (shift) lens for the Mamiya 645 medium format system. This is a highly sought-after specialized wide-angle lens (equivalent to ~31mm on 35mm full-frame), perfect for architectural, landscape, interior, and tabletop photography where precise perspective correction is essential.

Condition:

• Overall: Excellent cosmetic and functional condition for a 40+ year-old lens. All markings are sharp and clear, with only minor signs of normal use (light handling wear on the knurled focus/aperture rings and barrel).

• Optics: Front and rear elements are clean with no haze, fungus, mold, separation, scratches, or coating damage. The multi-coated glass shows a healthy purple/green tint. There is some typical internal dust (visible specks when viewed against a bright light), but it is minor and does not affect image quality in practice—common in vintage Mamiya lenses and easily ignored for most shooters.

• Mechanics: Smooth, precise focus ring with full travel from close focus to infinity. Aperture ring clicks positively through all stops (f/4 to f/32). Shift mechanism rotates smoothly with secure click-stops and the full ~16mm shift range (no play or looseness). The built-in hood is intact and fully functional.

• Other Details: Includes lens hoods both front and rear caps (not shown in photos but included). Serial number: 142250. No box or manual, but this lens is simple to operate.

Key Features:

• Focal Length: 50mm (wide-angle perspective control)

• Aperture Range: f/4 to f/32

• Shift: Up to ~16mm (rotating mount for horizontal/vertical correction)

• Filter Size: 77mm (standard for many Mamiya lenses)

• Mount: Mamiya 645 (compatible with M645, 645 Super, Pro, Pro TL, 645E, and even adapted to digital bodies like Phase One)

• Optical Design: 10 elements in 8 groups – sharp when stopped down to f/8–f/16, with excellent contrast and minimal distortion for a shift lens.

This is the only true shift lens ever made for the Mamiya 645 system—rare and desirable among medium format enthusiasts. It’s fully functional and ready to shoot film or adapt to digital.

Shipping: Carefully packed in bubble wrap and a sturdy box. US shipping via USPS Priority Mail with tracking and insurance or UPS. International buyers shipped through eBay.  Returns: Accepted within 30 days if not as described (buyer pays return shipping). No returns on used gear for “change of mind.”

Feel free to message with any questions—happy to provide more photos.

Keywords for search: Mamiya 645 shift lens, Mamiya Sekor 50mm f4, perspective control lens, PC lens, architectural lens, medium format wide angle

Please Note: I encourage all buyers to review my seller feedback before purchasing. In the last 90 days, I have sold over 50 photography items (lenses, filters, accessories, etc.), and all have been described accurately with 100% positive feedback. I take pride in honest descriptions, careful packaging, and fast shipping—your satisfaction is important.