Olympus Infinity Twin 35mm film camera
Olympus Infinity Twin 35mm film camera
The Olympus Infinity Twin is a classic late 1980s 35mm point-and-shoot two fixed lenses (a wide 35mm/F3.6 with 3 elements/3 groups and a moderate telephoto 70mm/F6.3 with 5 elements/5 groups) that you can choose by clicking a button at the top. This camera was called the 'AF-1 Twin' in some countries.
Here's how it was reviewed in the March 1988 issue of Popular Photography:
How do you get 35mm wide-angle and 70mm tele lenses into a "superbly compact," weatherproof point-and-shoot 35? Olympus does it with a "unique bi-axial optical system” -in other words, with mirrors (see diagram). It may not be obvious, but both the front-element-focusing 70mm f/6.3 tele and the unit-focusing 35mm f/3.5 wide-angle mounted below it have separate, inter-lens, programmed electronic shutters that fire simultaneously for every exposure. The position of the bottom mirror (it's controlled by the focal-length selector) determines which lens gets to take the picture. The tele has an aspheric element in its rear optical group.
As befits a leading-edge design, the Infinity Twin's sleek, pocketable body contains all modern conveniences that include autoloading, autorewind, continuous wind from 1.5 to 4 frames per second autoexposure, DX from ISO 50 to 3200, LCD frame counter, one- or two-shot electronic self-timer, and a bright frame finder with focus and flash-ready LEDs.
Its 16-step IR autofocus system gets down to 2½ feet, and the built-in flash comes on when needed, recycling in a claimed 3 seconds in single-shot mode, 1 second (at lower output) in continuous mode. The
Twin is lithium-powered and "'weatherproof to JIS grade 4, which means it's splashable but not submersible.
This camera requires two CR123 batteries (available as an option).
The camera was tested with film and delivered sharp, correctly exposed images. It is in very good cosmetic condition (see photos). In addition, we verified the camera's film plane focus on an autocollimator as well as its auto-exposure performance using a calibrated light source and a shutter tester.
Here are some pictures that other people have taken with the Infinity Twin/AF-1:
- Type: Fully automatic 35mm autofocus lens-shutter camera with biaxial, bifocal lens system.
- Film format: 35mm standard DX coded film (24 x36mm)
- Lens: Olympus lens 35mm F3.5, 3 elements in 3 groups/ 70mm F6.3, 5 elements in 5 groups. Selection of Wide-angle/ Telephoto focal length: motorized switchover of two optical axes.
- Shutter: Programmed electronic shutter.
- Viewfinder: Bright frame viewfinder. Wide-angle: 0.43X,
- Telephoto: 0.76X (provided with autofocus frame, flash activation indicator lamp, and in-focus indicator lamp).
- Focusing: Active type infrared autofocus system, focus lock possible. Focusing range: 2.5 ft -o at wide-angle. 2.6 ft - o at telephoto.
- Exposure control: Automatic exposure control with programmed electronic shutter. Automatic control range with ISO 100 film: wide-angle: EV 7.7 (F3.5. 1/15 sec.) to EV 16 (F9.5. 1 / 730 sec.) telephoto: EV 9.6 (F6.3, 1/15 sec.) to EV 17 (FI5.1, 1/570 sec.)
- Exposure counter: Progressive type, displayed in LCD panel.
- Self-timer: Electronic self-timer with 12-second delay (clock icon) mark is displayed on LCD panel with "CONT (clock icon)” button. and self-timer is started with shutter release button. Red LED turns on), Continuous shooting (2 shots) possible with self-timer.
- Film speed range: Automatic setting with DX-coded film. (ISO 50 - 3200) Actual setting at ISO 50. 100, 200, 400, 800, 1600, 3200.
- Film loading: Automatic loading, film automatically advances to first frame when camera back is closed
- Film advance: Automatic film winding, continuous shooting of up to 4 frames possible. (approx. 1.0 frame per seconds)
- Film rewind: Automatic rewinding. Automatic rewind actuation at the end of film. automatic rewind stop. Rewinding the film in the middle of a roll is possible by pressing the rewind button.
- Flash: Built-in, recycling time approx. 2 sec. (at normal temperature). Flash range with color negative film: when using ISO 100 film: 2.5 20.7 (13.1) ft at wide-angle. 26- 11.8 (7.2) ft at telephoto. When using ISO 400 film: 2.5 - 41.3 (26.2) ( at wide-angle, 2.6 - 23.6 (14.4) ft at telephoto. Data in parenthesis for continuous shooting.
- Flash modes: AUTO (flash automatically fires in low light and backlight), OFF (activation stop), and FILL-IN (forced activation, slow-synchro possible with longest shutter speed of 1/15 sec.).
- Battery check: Indicated on LCD panel,
- Lens barrier: Sliding type (with release lock).
- Weatherproof: IC Standard publication 529. Classification of degrees of protection provided by enclosures. Degrees of protection indicated by the second characteristic numeral 4 • Short description: Protected against splashing water • Definition; Water splashed against the enclosure from any direction shall have no harmful effect • Test for second numeral 4: The equipment is sprayed from all practical directions. The water pressure is adjusted to give a delivery rate of 10 lit. / min. The test duration shall be 1 min. per m square calculated surface area of the enclosure with a minimum duration of 5 min.
- Power source: Two 3V lithium batteries (DL123A/CR123A)
- Dimensions: 5.0" (W) x 2.5 (H) x 2.0" (D)
- Weight: 9.0 oz. (without batteries).