Difference between revisions of "Pentax ES"
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| + | <!--Not sure how copyright stands on recent advertising... this doesn't fit in any of the Public Domain categories, and is it Nesster's to licence under Creative Commons? --> | ||
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| + | |image_source= http://www.flickr.com/photos/nesster/3357286948/in/pool-camerawiki | ||
| + | |image= http://farm4.static.flickr.com/3609/3357286948_bb1a1f9de1.jpg | ||
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| + | |image_text= Pentax ES, advertised April 1973 | ||
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| + | The '''Pentax ES''' was announced by [[Pentax|Asahi]] in 1971,<ref>According to [http://www.pentaximaging.com/about/history/ Pentax Imaging]; [[McKeown]] dates it to 1972.</ref> as the world's first SLR with 'fully-automatic electronic shutter'. It offers what has since become familiar as [[aperture priority]] automatic exposure ([[shutter priority|''shutter'' priority]] AE was already possible with other cameras, such as the [[Canon F-1]], at this time). Electronic shutter timing makes aperture-priority AE possible because it allows the shutter speed to be essentially continuously variable, not restricted to whole or half-stop values. Manually-set shutter speeds on the ES are ''mechanically'' timed, however, and so not dependent on the camera battery. The camera also makes an early use of a memory circuit in exposure control, to store the exposure setting in the brief period of 'blackout' when the mirror is moved to allow exposure. | ||
| − | ===Specifications=== | + | Asahi <ref name=manual>[http://www.pentaximaging.com/files/manual/ES.pdf User's Manual] for the ES (pdf) at [http://www.pentaximaging.com Pentax Imaging]</ref> emphasised the advantage that, since the mechanisms involved in this mode of AE were in the camera body, not the lens, the camera could be used, in AE, with almost all existing Takumar lenses. |
| − | Camera type: 35 mm [[SLR]] camera | + | |
| − | Standard lens: 55 mm f/1.8 or 50 mm f/1.4 SMC<ref>Super Multi-Coated.</ref> Takumar. | + | ===Specifications<ref name=manual></ref>=== |
| + | Camera type: 35 mm [[SLR]] camera with TTL metering and aperture-priority AE | ||
| + | |||
| + | Standard lens: 55 mm f/1.8 or 50 mm f/1.4 SMC<ref>Super Multi-Coated.</ref> Takumar; | ||
| + | (the ''Super'' Takumar lenses of the same length and aperture do not fit). | ||
Shutter: | Shutter: | ||
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* ''No'' delayed action | * ''No'' delayed action | ||
* Shutter cocked by advancing the film (shutter-cocked indicator: red dot in window next to shutter release) | * Shutter cocked by advancing the film (shutter-cocked indicator: red dot in window next to shutter release) | ||
| + | |||
| + | Metering: | ||
| + | * CdS Through-the-lens meter. Usable in full-aperture AE or stopped-down metering. | ||
| + | * Sensitivity EV 1-18 at ISO 100. | ||
| + | * Exposure compensation -1 to +2 stops offset possible (dial around rewind crank) | ||
| + | * Film speeds ISO 20-1600 can be set (dial around rewind crank) | ||
[[Flash sync]]hronisation: [[Hot shoe]] (synchronised for X-synch. at 1/60 sec) and separate [[PC socket]]s beside lens mount for X- and FP-synch. | [[Flash sync]]hronisation: [[Hot shoe]] (synchronised for X-synch. at 1/60 sec) and separate [[PC socket]]s beside lens mount for X- and FP-synch. | ||
| − | Viewfinder: Pentaprism viewfinder. Fresnel focusing screen has a central microprism focusing aid. | + | Viewfinder: |
| + | * Pentaprism viewfinder. | ||
| + | * Fresnel focusing screen has a central microprism focusing aid. | ||
| + | * Meter scale at right hand side shows shutter speeds 1-1/1000 second. | ||
Film advance: Single-stroke winding lever. | Film advance: Single-stroke winding lever. | ||
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Film rewind: folding crank; rewind release button on base. | Film rewind: folding crank; rewind release button on base. | ||
| + | Dimensions (width x height x depth): 143 x 98 x 91 mm (presumably with standard lens fitted) | ||
| + | Weight: 940 g (presumably with standard lens fitted) | ||
| − | + | Battery: 4SR44 6V silver oxide (or PX28A, 4LR44 etc. equivalents) | |
| − | + | Battery check button next to rewind crank (meter needle should fall below 1/30 sec mark) | |
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===Notes=== | ===Notes=== | ||
Revision as of 01:13, 18 April 2011
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The Pentax ES was announced by Asahi in 1971,[1] as the world's first SLR with 'fully-automatic electronic shutter'. It offers what has since become familiar as aperture priority automatic exposure (shutter priority AE was already possible with other cameras, such as the Canon F-1, at this time). Electronic shutter timing makes aperture-priority AE possible because it allows the shutter speed to be essentially continuously variable, not restricted to whole or half-stop values. Manually-set shutter speeds on the ES are mechanically timed, however, and so not dependent on the camera battery. The camera also makes an early use of a memory circuit in exposure control, to store the exposure setting in the brief period of 'blackout' when the mirror is moved to allow exposure.
Asahi [2] emphasised the advantage that, since the mechanisms involved in this mode of AE were in the camera body, not the lens, the camera could be used, in AE, with almost all existing Takumar lenses.
Specifications[2]
Camera type: 35 mm SLR camera with TTL metering and aperture-priority AE
Standard lens: 55 mm f/1.8 or 50 mm f/1.4 SMC[3] Takumar; (the Super Takumar lenses of the same length and aperture do not fit).
Shutter:
- Horizontally-running focal plane shutter with electronic or mechanical timing
- In AE, shutter speed is continuously variable from 8 - 1/1000 second
- Mechanically timed shutter speeds 1/60 - 1/1000 second and 'B' can also be set manually
- No delayed action
- Shutter cocked by advancing the film (shutter-cocked indicator: red dot in window next to shutter release)
Metering:
- CdS Through-the-lens meter. Usable in full-aperture AE or stopped-down metering.
- Sensitivity EV 1-18 at ISO 100.
- Exposure compensation -1 to +2 stops offset possible (dial around rewind crank)
- Film speeds ISO 20-1600 can be set (dial around rewind crank)
Flash synchronisation: Hot shoe (synchronised for X-synch. at 1/60 sec) and separate PC sockets beside lens mount for X- and FP-synch.
Viewfinder:
- Pentaprism viewfinder.
- Fresnel focusing screen has a central microprism focusing aid.
- Meter scale at right hand side shows shutter speeds 1-1/1000 second.
Film advance: Single-stroke winding lever.
Film rewind: folding crank; rewind release button on base.
Dimensions (width x height x depth): 143 x 98 x 91 mm (presumably with standard lens fitted)
Weight: 940 g (presumably with standard lens fitted)
Battery: 4SR44 6V silver oxide (or PX28A, 4LR44 etc. equivalents)
Battery check button next to rewind crank (meter needle should fall below 1/30 sec mark)
Notes
- ↑ According to Pentax Imaging; McKeown dates it to 1972.
- ↑ 2.0 2.1 User's Manual for the ES (pdf) at Pentax Imaging
- ↑ Super Multi-Coated.
