Pentax 645
Pentax 645 with 75 mm normal lens
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| Overview | |
|---|---|
| Maker | Pentax |
| Type | Single-lens reflex camera |
| Lens | |
| Lens mount | Pentax 645 A mount |
| Sensor/Medium | |
| ASA/ISO range | ISO 6-6400 in 1/3 stop increments |
| Recording medium | medium format film |
| Focusing | |
| Focus | manual (auto on 645N) |
| Exposure/Metering | |
| Exposure | automatic, manual |
| Exposure metering | TTL center-weighted |
| Flash | |
| Flash | hot shoe, socket, X-sync |
| Shutter | |
| Shutter | vertical cloth focal plane |
| Shutter speeds | 15 s - 1/1000 s, Bulb |
| Viewfinder | |
| Viewfinder | fixed eye-level pentaprism |
| General | |
| Battery | 6 AA |
| Weight | 46.2 ounces (1,310 g) |
| Made in | Japan |
The Pentax 645 is a medium format single-lens reflex system camera manufactured by Pentax. It was introduced in 1984, along with a complementary line of lenses. It captures images nominally 6 cm × 4.5 cm on 120, 220, and 70 mm film, though the actual size of the images is 56 mm × 41.5 mm.
The 645 is the original model introduced in 1984. It has a built-in 1.5 frames per second motor drive, center-weighted TTL metering, multiple automatic exposure modes, and a small LCD screen on the top plate which indicates mode, exposure compensation, and exposure count. Unlike comparable medium-format cameras, the 645 does not have an interchangeable back system. Instead, the film is loaded into holders, which are then inserted into the rear of the camera. The holders cannot be removed until an entire roll is shot. The crop factor vs. a 35 mm camera is .62.
In 1997, a significantly redesigned model was introduced. The 645N incorporated an auto-focus system, and most of the 645 lenses were upgraded to match. The new model also featured matrix metering, film-edge data imprinting, and a self-timer. The controls and LCD on the top plate were significantly changed, and the motor drive was increased to 2 frames per second.
The 645NII is the latest model and was introduced in 2001. The main improvement was the addition of mirror lock-up.
The Pentax 645D is a digital single-lens reflex camera introduced in 2010. It is approximately the same size and shape as the earlier film models, and the lens mount accepts older manual and auto-focus lenses. It features a 40 megapixel CCD sensor manufactured by Kodak. The 7264×5440 pixel sensor measures 44 mm × 33 mm, which is less than 63% the size of a 6×4.5 cm film image but over 168% of a full-frame DSLR. Unlike other medium-format DSLRs, which accept digital camera backs of different resolutions or even manufacturers, the 645D has a fixed-back design similar to smaller full-frame and APS-C DSLRs. The fixed back allows the 645D to be fully weather-sealed. The crop factor vs. a 35 mm camera is 0.79.
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Wikipedia