Mamiya Sekor Z 150mm f/3.5 W Lens for RZ67 System {77}

Mamiya RZ67's go-to portrait focal length in medium format.

On the RZ67's 6x7cm format, 150mm lands squarely in portrait territory, giving you a working distance that flatters subjects without compression going clinical. The f/3.5 maximum aperture is exactly what you want for medium format work: enough light-gathering for studio and outdoor available-light sessions, and the depth-of-field rendering at this aperture on a 6x7 negative is categorically different from anything a 35mm or APS-C system produces at the same f-stop. The 77mm filter thread is a standard size, so polarizers and ND filters you already own likely fit.

The Z designation means this lens is purpose-built for the RZ67's rotating back system and leaf shutter mechanism, which sits inside the lens body than the camera. That placement allows flash sync at any shutter speed the lens supports, a real practical advantage for mixing strobe and ambient light. For film shooters working with a full RZ67 kit, the 150mm W is often the first lens they reach for after the standard 90mm.

Who It's For

Portrait photographers shooting film on the RZ67 will find the 150mm focal length and f/3.5 aperture well-matched to the format's rendering characteristics, particularly for head-and-shoulders framing with subject separation that medium format makes possible. Studio photographers benefit from leaf shutter flash sync at any speed. Travel and documentary shooters building a compact RZ67 kit often treat this as a second prime alongside the 90mm. The 77mm filter thread also makes it practical for outdoor workers who already carry that filter size for landscape or fashion work.

Key Features

• 150mm focal length optimized for RZ67 6x7cm portraiture
• f/3.5 maximum aperture for medium-format depth-of-field control
• Leaf shutter allows flash sync at any supported speed
• 77mm filter thread accepts standard polarizers and ND filters
• Z-series design compatible with RZ67 rotating back system

FAQ

What's the field of view on 6x7 film with this 150mm?

On the RZ67's 6x7cm format, 150mm gives you a moderate telephoto angle-tight enough for portraiture without the subject feeling claustrophobic, wide enough that you're not wrestling with extreme compression.

Can you use this lens with flash at all shutter speeds?

Yes. The Z-series leaf shutter built into the lens body syncs flash at any speed the lens supports, unlike focal-plane shutter cameras where flash sync caps out at a specific speed.

Will my existing 77mm filters work on this lens?

Yes, the 77mm filter thread means any standard 77mm filters-polarizers, NDs, warm tones-mount directly. No adapter rings needed.

Is f/3.5 fast enough for available-light work on medium format film?

f/3.5 on a 6x7 sensor with fast film (Portra 400, Tri-X) handles most indoor and outdoor available-light situations without forcing you to shoot wide open. In dim indoor work you may need a tripod or fast film, but it's workable.

How does this compare to the standard 90mm lens on the RZ67?

The 90mm is the workhorse; the 150mm stretches into portraiture. The 150mm gives you better subject isolation and a longer working distance-you're standing further back, which feels more natural for portraits than hovering with a 90mm.

Does the RZ67 rotating back work with this lens?

Yes. The Z-series design is built for the RZ67's rotating back system, so you can switch between horizontal and vertical framing without removing the lens.

What type of shutter does this lens have?

A leaf shutter integrated into the lens barrel, which is why flash syncs at any speed and why each Z-series lens is interchangeable on the RZ67 body.