w/Caps【Top Mint】MAMIYA-SEKOR ZOOM ULD C 105-210mm f/4.5 for Mamiya 645 #E0587

• Focus ring works smoothly
• Zoom ring works smoothly
• Aperture ring clicks properly
• Aperture blades move smoothly

• No fungus
• No haze or fog
• No scratches
• No balsam separation

• Brand: Mamiya
• Model: Mamiya-Sekor Zoom ULD C 105-210mm f/4.5
• Lens Type: Manual-Focus Telephoto Zoom Lens
• Lens Mount: Mamiya 645 Bayonet
• Compatible Cameras: Mamiya M645 1000S, M645J, M645 Super, 645 Pro, 645 Pro TL and other Mamiya 645 manual-focus bodies
• Film Format: Medium Format 6×4.5
• Focal Length: 105–210mm
• 35mm Equivalent Focal Length (Approx.): 65–130mm
• Maximum Aperture: f/4.5 (Constant)
• Angle of View (Diagonal, Approx.): 37° – 19°
• Optical Glass: ULD (Ultra-Low Dispersion) Glass Elements
• Lens Coating: Multi-Coated
• Focus Type: Manual Focus
• Aperture Type: Automatic Diaphragm
• Lens Series: Sekor C
• Made in: Japan

The Mamiya-Sekor Zoom ULD C 105-210mm f/4.5 is a medium format telephoto zoom designed for the Mamiya 645 system, covering a range that corresponds roughly to 65–130mm in 35mm terms. It brings the flexibility of a zoom to the 6×4.5 format while retaining the image quality medium format shooters expect. For many Mamiya 645 users it replaces a pair of short and medium telephoto primes with a single, well-built lens.

The ULD designation refers to Ultra-Low Dispersion glass, which Mamiya used in this design to control chromatic aberration across the zoom range. The result is clean, contrasty images with good color separation and fine detail, especially when stopped down a little. Combined with the large 6×4.5 negative, the lens can deliver prints and scans with the tonal richness that makes medium format so appealing.

A constant maximum aperture of f/4.5 means exposure stays the same as you zoom, which is a real convenience when using a handheld meter or working with studio lighting. Framing can be adjusted without re-metering, and the viewfinder brightness stays consistent throughout the range. This makes the lens pleasant to use for both deliberate studio work and more spontaneous outdoor shooting.

Build quality follows Mamiya's professional standards of the era, with a solid metal barrel, smooth focusing and a precise aperture ring with clear click stops. The lens couples with the automatic diaphragm of Mamiya 645 bodies, so you compose and focus at full aperture while the lens stops down at the moment of exposure. It balances well on bodies such as the M645 1000S, 645 Super and 645 Pro, particularly when used on a tripod.

The 105–210mm range is ideal for portraiture, from head-and-shoulders framing to tighter facial studies, while keeping a comfortable working distance from your subject. It is equally useful for landscapes, where compressing perspective and isolating distant details is often more effective than going wide. Fashion, product and outdoor environmental portraits also suit this lens very well.

The lens mounts directly on Mamiya 645 manual-focus bodies, including the M645 1000S, M645J, 645 Super, 645 Pro and 645 Pro TL. With a suitable adapter, it can also be used on modern mirrorless cameras, including medium format digital systems, where focus peaking and magnification make precise manual focusing straightforward. This gives the lens a second life for photographers who want medium format character on digital.

Zoom lenses for medium format systems are far less common than primes, and a well-corrected design with ULD glass and a constant aperture remains a practical tool today. Film photographers appreciate being able to fine-tune composition without changing lenses or position, which saves both time and film. Its optical quality and robust construction are why it continues to be sought after by Mamiya 645 users.

If you shoot with a Mamiya 645 system and want a versatile telephoto that covers the most useful portrait and landscape focal lengths in one lens, the Mamiya-Sekor Zoom ULD C 105-210mm f/4.5 is an excellent choice. It offers dependable optics, solid construction and genuine convenience for film and adapted digital use alike. It is a lens that can quickly become a core part of a medium format kit.