Mamiya Leaf Sekor Zoom 105-210mm f/4.5 AF ULD IF

The Mamiya Leaf Sekor Zoom 105-210mm f/4.5 AF ULD IF is a telephoto zoom lens for the Phase One / Mamiya 645 system, covering a useful portrait-to-telephoto range with a constant f/4.5 aperture, autofocus, and a 58mm filter thread — all in a 990g body that medium format shooters consistently describe as well-balanced and not overly cumbersome.

Mamiya Leaf Sekor Zoom 105-210mm f/4.5 AF ULD IF — Key Specs

• Focal length: 105–210mm telephoto zoom range
• Maximum aperture: f/4.5 constant throughout the zoom range
• Minimum aperture: f/32
• Lens mount: Medium Format Phase One / Mamiya 645
• Autofocus: Yes — AF with ULD (Ultra-Low Dispersion) and IF (Internal Focus) design
• Minimum focus distance: 1.5m
• Filter thread: 58mm
• Weight: 990g
• Image stabilisation: No

Who Is This Mamiya 105-210mm f/4.5 For?

If you shoot portraits, weddings, or sports on a medium format system and want a single zoom that covers the flattering compression of 105mm through to the reach of 210mm, this is one of the very few AF telephoto zooms built natively for the Phase One / Mamiya 645 mount. The Mamiya Leaf branding on this variant indicates it was sold and validated through Mamiya Leaf's professional digital imaging channel — the same lens optics and mount as the standard Sekor line, but positioned for studio and commercial digital back users. The ULD glass elements control chromatic aberration across the zoom range, and internal focusing means the front element doesn't rotate — handy when you're using polarisers or graduated ND filters. At Camera-tweedehands.nl, every lens is hand-inspected for optical clarity, mechanical function, and physical condition — including the lens hood. It's a practical working lens for any Mamiya 645 shooter who needs versatility without swapping primes mid-shoot. Note that this lens has no image stabilisation, so a steady hand or fast shutter speed matters more at 210mm.