1. Overview & Verdict
The Mamiya 645 is a modular medium format SLR system, first released in the 1970s and updated through several later generations, shooting 120 or 220 roll film in the 6x4.5cm format. Unlike a fixed-body 35mm SLR, the system is built from separate components — body, lens, film back, and viewfinder — which you can mix and match, but which also means more parts that can individually go wrong.
Our take: this is not a beginner's first camera. It's the natural next step once you've learned exposure fundamentals on 35mm and want a meaningful jump in negative size and image quality for portraits, landscapes, or studio work. Because it's a modular system, buying "body only" is common on eBay — make sure you understand exactly what's included before you bid.
Check Current Mamiya 645 Listings on eBay UK2. Why Step Up to Medium Format
A 6x4.5cm negative has roughly four times the surface area of a standard 35mm frame, which translates into finer grain, smoother tonal transitions, and noticeably more detail when enlarging prints or scanning at high resolution. For portrait and studio photographers in particular, the format is also prized for the different depth-of-field character it produces compared with 35mm.
The modular design means you can start with a basic body and standard 80mm lens, then add a metered prism finder, additional lenses, or a second film back for shooting different film stocks side by side, as your needs and budget allow.
3. Common Faults to Check For
- Film back light seals: the foam seals inside the removable film back perish with age just like on 35mm cameras, and because the back is a separate light-tight compartment, a bad seal here can ruin an entire roll rather than just a few frames.
- Dark slide and back interlock issues: the system relies on a dark slide and mechanical interlocks to prevent accidental light exposure when changing backs mid-roll; a sticky or worn interlock can lead to fogged frames.
- Meter prism inaccuracy: on bodies fitted with a metered prism finder, the meter cell can drift out of calibration or fail outright with age; test it against a known-good handheld meter or another camera before relying on it.
- Mirror and shutter faults on long-idle bodies: cameras that have sat unused for years can develop a sticking mirror or sluggish shutter timing, similar to other mechanical SLRs, and are worth firing repeatedly during inspection before buying.
- Lens fungus and haze: as with any vintage glass, check for fungus growth or internal haze, which is more costly to professionally clean on medium format lenses than on common 35mm glass.
4. Pre-Purchase Checklist
- Confirm exactly what's included: body, lens, prism/finder, and film back are often sold separately, so a "body only" listing needs its own lens and back to be usable.
- Ask whether the film back has been tested with an actual roll of 120 film, not just dry-fired.
- Check listing photos for the condition of the felt/foam light trap on the film back specifically, not just the body.
- If a metered prism is included, ask the seller to confirm the meter responds to changes in light.
- Factor in that 120 film and its processing cost more per roll than 35mm — budget for the ongoing cost, not just the camera purchase.
5. What Should You Pay?
| Configuration | Typical UK Price | What to Expect |
|---|---|---|
| Body only, untested | £150 – £300 | You'll still need to source a lens, finder, and film back separately |
| Body + 80mm lens + finder + back, tested | £600 – £1,100 | A complete, ready-to-shoot kit — the realistic entry point for most buyers |
| Full kit with multiple lenses/backs | £1,200 – £2,000+ | Worthwhile only if you specifically need the extra lenses or backs |
Prices are approximate, based on typical UK sold listings, and vary with included accessories, seller location, and condition.
6. Alternatives to Consider
- Bronica ETRSi: a similar 6x4.5 modular system, often priced somewhat lower on the used market.
- Pentax 645: a more automated, SLR-style medium format option for those who want autofocus and program modes rather than a fully manual system.
- Pentax K1000: if the running cost and complexity of medium format feels like too big a jump right now, our Pentax K1000 review covers the more affordable 35mm starting point.
7. Frequently Asked Questions
Is the Mamiya 645 good for beginners?
It's a reasonable step up once you already understand exposure basics, but the modular system, higher running cost per roll, and lack of a built-in meter on some bodies make it a less forgiving first camera than a 35mm SLR.
What film does the Mamiya 645 use?
It uses 120 or 220 roll film in the 6x4.5cm medium format, giving roughly four times the negative area of 35mm, though 220 film is now largely discontinued and hard to find.
What commonly goes wrong with a used Mamiya 645?
The most common issues are light seal decay in the film back, sticky or inaccurate metered prism finders, and mirror or shutter faults on bodies that have sat unused for long periods.