Body group OM-20 (US: OM-G)
In 1983 the OM-20 (which was named OM-G in the US) was introduced. This model incorporates quite a few improvements compared to the OM-10: a shutter speed ring instead of a removable Manual Adapter, an exchangeable camera grip (Steady Grip 2), a better Mode Selector Lever and Exposure Compensation Dial, slightly larger controls, a new matte area (Lumi Micron) in the focusing screen, a better display (with a Manual Mode Indicator, an Exposure Compensation Indicator and shutter speed number LEDs), a sunken Hot Shoe, Motor Drive capability and a PC flash synchro bus. The OM-20 didn't replace the OM-10: both models were available untill 1987. The OM-20 was available in chrome and in black.
Main specifications
| Unit type: 35mm SLR Reflex with automatix exposure control, electronic focal plane shutter. | Focusing screen: Fixed Lumi-Micron microprism/split image-matte screen. |
| Film format: 24mmx36mm. | Finder view-field: 93% of actual picture field. |
| Lens mount: Olympus OM Mount, bayonet type. | Viewfinder magnification: 0.92X with 50mm lens at infinity. |
| Shutter: Focal plane shutter, automatic exposure control from 2 seconds to 1/1000 second (ASA 100, F1.2 at normal temperature and humidity). | Indicators in viewfinder: 12-step shutter speed scale (indicated with shutter speed LEDs) with overexposure marker and flash charge (triggered by T series flashes); Manual Mode indicator and Exposure Compensation indicator. |
| Synchro: X contact. Direct contact only. In combination with a T series flash the 1/60 synchro speed is automatically selected. | Reflex mirror: Oversize, quick return mirror. |
| Automatic exposure control: Aperture-priority electronically
controlled shutter. TTL Direct (OTF) Light Measuring system. Measuring range: EV-0.5~EV18 from 2 sec. to 1/1000 sec. at normal temperatures and humidity with ASA 100 and F1.2 50mm. lens. Exposure compensation: ±2 EV. |
Film advance: Lever type with 130° angle. It can be wound with one
long or several short strokes, 30° pre-advance angle. Power winding is possible with a
Winder or Motor Drive. With Motor Drive 1 or 2 unit attached, single frame and continuous advance at speed of 5 frames per second (at exposures of 1/500 sec. and above, with fresh batteries and at normal temperature and humidity). |
| Manual exposure control: 1-1/1000 sec., ring mounted control. | Exposure counter: Progressive type with automatic reset when camera back is opened. |
| Film speed setting: ASA 25-1600. | Film rewind: Crank type, with rewind release lever setting, automatic return. |
| Battery check: Battery voltage can be checked by both LED and PCV (acoustic signal). Mirror lock to limit drainage. | Self-timer: Electronic self-timer with about 12 second delay. |
| Power source: Two 1.5 silver oxide batteries SR44 (Eveready or UCAR EPX-76 or equivalent). | Accessory shoe: Built-in type, with X-contact and contact for flash ready / flash ok signal with T series flash (flash ok signal with Normal Auto mode only). |
| Viewfinder: Pentaprism type. | Dimensions and weights: Body only: 135x84x50mm, 430g. With 50mm/F1.8 lens: 135x84x81mm, 600g. With 50mm/F1.4 lens: 135x84x89mm, 660g. |
