Mamiya 150mm f/3.5 AF Lens for Mamiya 645AF, Phase One {58}

Mamiya 150mm f/3.5 AF: medium format portrait reach with autofocus

The 150mm focal length has long been a favorite in medium format portrait work, and this Mamiya AF version brings autofocus to that tradition on 645-format bodies. The f/3.5 maximum aperture gives you meaningful subject separation at this focal length, keeping backgrounds out of the plane of focus while the lens locks on without the deliberate pace of manual glass. It accepts 58mm filters, so you can use a warming filter or circular polarizer without hunting for specialty sizes.

Compatibility covers both Mamiya 645AF bodies and Phase One digital backs, which matters a great deal in the medium format world where glass often outlasts the bodies it was bought for. Photographers who moved from a Mamiya 645AF body to Phase One hardware can carry this lens forward without skipping a beat. At 150mm with autofocus, this is the kind of optic that earns regular rotation in a working kit than sitting in a bag for special occasions.

Who It's For

Portrait photographers shooting on Mamiya 645AF or Phase One systems will find this lens fits naturally into a standard shooting day, where autofocus at 150mm keeps up with subjects who aren't standing still. Studio photographers working with medium format digital backs benefit from the Phase One compatibility, letting a single lens serve across body generations. Documentary and editorial shooters who need the compressed perspective of a longer focal length without sacrificing autofocus will appreciate what f/3.5 offers at this distance. Collectors and working photographers building out a 645AF kit gain a telephoto option that doesn't require a system change.

Key Features

• 150mm focal length for portrait work in 645 format
• f/3.5 maximum aperture for subject isolation
• Autofocus operation on 645AF and Phase One bodies
• 58mm filter thread for standard accessories
• Mamiya 645 AF mount compatibility

FAQ

Does this lens work on Phase One digital backs?

Yes. The 150mm f/3.5 AF is compatible with both Mamiya 645AF film bodies and Phase One digital backs, so the glass travels with you if you upgrade systems.

What autofocus speed can I expect?

The lens has autofocus, but the verified specifications don't include focus speed data. You'll want to test it on the body you're pairing it with.

What filter size does this lens take?

58mm. Standard size, so you don't need specialty filter inventory for this focal length.

Is 150mm considered a portrait lens in medium format?

The 150mm focal length has been a portrait standard in 645-format work for decades. The f/3.5 aperture gives you subject separation while keeping the focal length manageable for handheld work or studio setups.

Can I use this lens on other medium format mounts?

No. This is mount-specific to Mamiya 645 AF. It won't fit other 645 bodies or other medium format systems.

What's the maximum aperture?

f/3.5. Wide enough to isolate subjects in medium format and handle modest interior light without pushing film or sensor gain.