The original Mamiya RB67 and the later RB67 Pro S are two generations of the same medium format system, so they share the same basic design: a large 6×7 film SLR with a rotating back and bellows focusing. The Pro S is the more refined version, but the choice often comes down to condition on the used market, not the model name alone. Confirm exact differences on reliable reference pages.
What They Have in Common
Both cameras are modular. You can swap lenses, film backs and viewfinders, and the back rotates so you can switch between vertical and horizontal frames without turning the camera. Both make 6×7 negatives on 120 or 220 film depending on the back, and both are known for being heavy and mechanical.
Lenses have built-in leaf shutters, so each lens carries its own shutter. This design suits flash sync at many speeds, which is one reason the system is popular for portraits and studio work.
Where the Pro S Differs
The Pro S is the later, improved edition of the earlier Pro model, and it adds refinements to the body and film handling. These refinements are generally aimed at making the camera more convenient and reliable to use. The exact list of changes is best checked on a trusted camera reference, since details vary between production runs.
| Factor | Original RB67 | RB67 Pro S |
|---|---|---|
| Generation | Earlier | Later refinement |
| Core design | Same system | Same system |
| Availability | Older, varied condition | Common on the used market |
| Parts compatibility | Check before mixing | Check before mixing |
Compatibility Checks
- Confirm that the lenses you want fit the body you are buying.
- Check whether film backs from one version work on the other, as some mixes are not ideal.
- Look at whether viewfinders and accessories you already own are supported.
Buying Steps for a Used Body
- Cock the shutter and fire at every speed to hear any irregularities.
- Look through the lens at the ground glass for dust, fungus or haze.
- Extend the bellows fully and check for cracks, pinholes and smooth movement.
- Check the film back advance, frame counter and the dark slide.
- Examine the light seals around the back and replace them if they are old.
- Ask for a test roll if the seller allows it.
Using It Well
The RB67 is heavy, so a tripod is the safest way to get sharp images. As a rough first guess for handheld use, many people try a shutter speed of 1/125 or faster with a normal lens, but the mirror and weight can still limit results. Allow time to learn the double exposure prevention and film loading routine.
FAQ
Is the Pro S worth choosing over the original?
If a Pro S in good condition is available at a similar level, it is often the more convenient choice. A well-kept original works fine too.
Can I use the same lenses?
Many lenses are shared across the line, but compatibility varies, so check before you buy.
The Short Version
Both are the same large 6×7 system. Choose the Pro S for its later refinements when condition is equal, and choose a clean original if you find a better example. Check lens and back compatibility before buying.
