Medium Format120
intermediateadvanced
Discontinued
Pentax 645
1984-1997
Entry to medium format
Format
120
Shutter
1/1000
Max speed
Metering
TTL
Battery req.
Weight
1050g
Best For
- Entry to medium format
- Wedding photography
- Portrait work
- Those wanting SLR handling
Features
- 6x4.5cm negative size
- Built-in motor drive
- Insert film back system
- Interchangeable focusing screens
- Program and manual modes
- 15 exposures on 120 film
Limitations
- Plastic body feel
- No interchangeable backs
- 6x4.5 smallest MF format
- Insert system can jam
Common Issues to Check
- Film insert mechanism jams
- Mirror damper deterioration
- Battery contact corrosion
- Meter accuracy drift
- Shutter capping at fast speeds
Buying Guide
The most accessible medium format system. Handles like an oversized 35mm SLR. The insert back system is unique - easier than standard backs but can jam. Check film advance works smoothly with inserts. Test all shutter speeds. The 645 lenses are sharp and affordable. Perfect entry to medium format.
Pricing
Typical Range£150 - £350
Excellent Condition~£450
Very affordable entry to medium format; with 75mm f/2.8 adds £100-150
Prices as of 2026-01. UK market, may vary.
Last verified: Jan 2026Report an error