Mamiya Sekor Z 250mm f/4.5 Lens for RZ67 System {77}

Mamiya RZ67's 250mm portrait workhorse at f/4.5

The Sekor Z 250mm f/4.5 sits in the focal length range that medium format portrait shooters have relied on for decades. On the RZ67's 6x7 format, 250mm produces the subject compression and working distance that flatters faces without crowding the subject, and f/4.5 gives you meaningful background separation even from a telephoto starting point. The 77mm filter thread is a practical bonus, it's a common size that fits into most filter kits without adapters.

The RZ67 system is built around its rotating back and bellows-driven focusing, and the Sekor Z lenses are designed specifically to work with that architecture. This 250mm pairs naturally with the system's portrait orientation workflow, letting you switch between horizontal and vertical framing without repositioning your tripod. If you're shooting film and printing large, medium format's native resolution demands a lens that holds up at the edges under enlargement, and the Z series was engineered to that standard.

For photographers already committed to the RZ67 ecosystem, this is the lens that extends the system into longer portrait and editorial work without stepping outside Mamiya's own optical family.

Who It's For

Studio portrait photographers working with the RZ67 will find the 250mm focal length gives them the subject-to-camera distance needed for natural perspective with minimal distortion. Documentary and editorial film shooters who need to isolate a subject in a busy environment benefit from f/4.5's separation at medium format scale. Photographers transitioning into medium format from 35mm who already understand the 200-300mm portrait range will adapt quickly to this lens's working distance and framing behavior.

Key Features

• 250mm focal length for RZ67 medium format portraiture
• f/4.5 maximum aperture for background separation
• 77mm filter thread fits standard screw-in filters
• Bellows-driven focusing designed for RZ67 system
• Rotating back compatible for horizontal and vertical framing
• Z series optical design optimized for enlargement sharpness

FAQ

What's the effective focal length on RZ67's 6x7 format?

250mm is the native focal length for the RZ67 system - no crop factor applies to medium format. On 6x7, it delivers the compression and working distance that's standard for portrait work without the distance penalties of longer telephoto lenses.

Is f/4.5 wide enough for background separation in portraits?

Yes. On medium format, f/4.5 produces meaningful bokeh separation even at longer distances, especially compared to 35mm telephotos at the same aperture. The larger film plane magnifies the depth-of-field effect.

Can I use my existing 77mm filters with this lens?

Yes, the 77mm filter thread accepts standard screw-in filters without adapters, which keeps your setup simple if you already have filters in that size.

Does this lens work with the RZ67's rotating back?

Yes. The Sekor Z series is designed for the RZ67's bellows-driven focusing and rotating back, so you can switch between horizontal and vertical framing without changing lenses or repositioning your tripod.

What's the optical design of the Sekor Z 250mm?

Mamiya's Z series lenses were engineered for edge-to-edge sharpness under large-format enlargement, but specific element count and optical formula are not documented in available specs.

How does this compare to other medium format 250mm lenses?

The Sekor Z 250mm f/4.5 is specific to the Mamiya RZ67 system and cannot be compared directly to lenses for other mounts like Hasselblad or Pentax 67.

Is this lens suitable for film photography?

Yes. The RZ67 system is film-centric, and the Z series lenses were engineered to resolve medium format's native resolution across the frame for large prints.