Asahi Pentax Pentax 67 (1969)
At 5 lbs. 5 oz, it fills both hands like a precision instrument - solid, deliberate, and large.
Overview
The Asahi Pentax Pentax 67, introduced as the Pentax 6x7 in 1969, is a medium format SLR film camera for photographers who wanted a 35mm-style system scaled up to 6x7. It isn't subtle. Owners report an elegant design, with a look that echoes larger 35mm SLRs while staying its own thing. Operation is fully electronic, which was a departure from mechanical norms at the time. A PX28 6v battery powers the shutter and metering functions. That makes the camera dependent on power, but it also gives consistent exposure control across its range.
Despite its size, the Pentax 67 system was built to be modular. It takes interchangeable prism viewfinders and a wide array of lenses, and users compare its flexibility to the Nikon F system. The dual bayonet lens mount handles two lens groups. Shorter to mid-telephoto lenses (35mm to 300mm) attach via the inner bayonet, and super-telephotos (400mm to 1000mm) use the outer. That accommodates extreme focal lengths without hurting balance or needing additional adapters. The system spans 35mm ultra-wide to 800mm telephoto, and most lenses are manual focus, which makes it a deliberate, hands-on tool rather than an automatic workhorse.
Specifications
| Manufacturer | Asahi Optical Joint Stock Co. / Pentax |
| Model | Pentax 67 |
| Type | SLR medium format system film camera |
| Production years | Introduced in 1969 |
| Film format | 6x7 |
| Film type | 120 and 220 film |
| Weight | 5 lbs. 5 oz without the wood grip |
| Dimensions | 7.5" wide by 6" tall by 6.75" deep (measured from back of camera to front of 105mm f2.4 lens) |
| Power source | Dependent on a PX28, 6v battery |
| Lens mount | Dual bayonet lens mounting system |
| Lens mount | Pentax 67 system |
| Lens compatibility (inner bayonet) | Lenses from 35mm to 300mm |
| Lens compatibility (outer bayonet) | Lenses from 400mm to 1000mm |
| Lens range | 35mm ultra-wide to 800mm telephoto |
| Lens focus type | Most lenses are manual focus |
| Shutter speed range | Includes 2s and 4s |
| Flash sync speed (standard) | Limited to 1/30s or slower |
| Flash sync speed (with specialty lenses) | Increases up to 1/500s |
| Viewfinder coverage | 100% |
| System includes | Camera body, an interchangeable prism viewfinder, and one or more lenses |
Key Features
Mirror Lock-Up Mechanism (MLU)
The Pentax 6x7 MLU variant, introduced in 1976, added a mirror lock-up function to reduce vibration during long exposures. The mirror goes up before the exposure, which eliminates the micro-jolt that can soften fine detail, especially at slower shutter speeds.
Fully Electronic Operation
Every shutter actuation, meter reading, and mode selection depends on the PX28 6v battery. That gives consistent timing and integration with the metering system, but without power the camera is inert. When powered, it delivers reliable, repeatable performance across its shutter range, including multi-second exposures.
100% Viewfinder Coverage
The viewfinder gives 100% coverage. What's seen through the prism is exactly what lands on film, with no cropping surprises. That matters in studio and architectural work, where framing must be exact. Combined with the bright, interchangeable viewfinder system, it gives users flexibility in shooting position and clarity in critical focus.
Dual Bayonet Lens Mounting System
The dual bayonet design is the defining engineering choice. Pentax split lens attachment into inner and outer mounts, which solved the problem of mounting very long lenses without destabilizing the camera or needing complex extension mechanisms. The inner bayonet handles the core lineup from 35mm to 300mm, and the outer bayonet supports 400mm to 1000mm telephotos. This separation keeps the flange distance and balance right, with no adapters or bellows. It's built for expansion, and the breadth of available optics shows it.
Leaf Shutter Lenses (Takumar 6X7 90mm F2.8 and others)
The system includes specialty lenses with built-in leaf shutters, the most notable being the Takumar 6X7 90mm F2.8. These lenses allow flash sync at speeds up to 1/500s, compared to the standard 1/30s limit of the focal-plane shutter. That is a significant advantage for outdoor fill-flash or high-speed action work in bright light.
Historical Context
The Pentax 6x7 was developed as Asahi's entry into the professional medium format market, directly challenging systems from Nikon and Canon. The 1999 release of the Pentax 67II was a later model with a built-in right-hand grip, brighter viewfinder, advanced AE metering, self-timer, and multiple exposure capabilities.
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