The Mamiya 645 and the Mamiya RB67 are both medium format film cameras, but they are very different tools. The 645 makes smaller 6×4.5 negatives in a lighter, more handheld-friendly body, while the RB67 makes large 6×7 negatives in a heavy, studio-style camera. Choose the 645 for mobility and the RB67 for maximum negative size. Confirm exact details on reliable maker or archive sources.
What Each Camera Is For
The Mamiya 645 family is a system of 120 roll film SLRs that handle much like a large 35mm camera. They suit portraits, events and travel where you want to move quickly and fit more frames on a roll.
The RB67 is a large, modular camera with a rotating film back, a waist-level finder in its typical setup and bellows focusing. It is a favorite for portraits and studio work where the camera sits on a tripod and shooting is deliberate.
Key Differences
| Trait | Mamiya 645 | Mamiya RB67 |
|---|---|---|
| Negative format | 6×4.5 | 6×7 |
| Frames per 120 roll | More | Fewer |
| Weight and size | Lighter | Heavy and bulky |
| Handheld use | Practical | Possible but demanding |
| Orientation change | Turn the camera | Rotate the back |
Choosing by Use
- Portraits in a studio: The RB67 offers a big negative and a rotating back, which is convenient for switching between vertical and horizontal frames.
- Events and travel: The 645 is easier to carry and shoot quickly.
- Landscape on a tripod: Either works. The RB67 gives a larger negative, while the 645 gives a lighter kit.
- Cost of film: More frames per roll on the 645 can mean less film use per image.
Buying Checklist for Used Bodies
- Check that the shutter fires at several speeds and sounds consistent.
- Look for light seals that have turned sticky or crumbly.
- Inspect the lens for haze, fungus and stiff focus.
- Confirm the film back advances properly and the frame counter works.
- For the RB67, test the bellows for light leaks or cracks.
- Ask about battery needs on electronic 645 models.
Handling Tips
With the RB67, a sturdy tripod and a slow, careful routine help produce sharp results. With the 645, a shutter speed near 1/125 or faster is a typical first guess for handheld work with a normal lens, though a prism finder and good technique matter more than any number.
FAQ
Which one has better image quality?
The RB67 negative is larger, which helps with detail and tonal smoothness at big print sizes. The 645 is still a sizeable step up from 35mm film.
Do they share lenses?
No. They use different mounts and lens lines, so each system needs its own glass.
The Short Version
Choose the Mamiya 645 if you want a lighter medium format camera you can use handheld. Choose the RB67 if you want the larger 6×7 negative and do not mind the weight and slower pace.
