Canon's eye-level Booster viewfinder is intended for low-light photography.
The Canon Booster is an interchangeable prism viewfinder intended for use on the Canon F series single lens reflex (SLR) camera. Originally produced in 1971, the Booster cannot be used with any of Canon's newer SLRs or digital DSLRs. Useful for low light and night photography, as well as any other subject requiring long exposure time, the Booster's electronic meter and timer help produce consistently precise photographs.
Instructions
1. Turn the Booster so the viewfinder window faces you. Use a small coin to open the battery compartment on the left side of the finder. Insert a fresh 6-volt silver oxide battery or replace the old one if necessary.
2. Pull up and rotate camera's shutter speed selector dial to set the appropriate film speed. For example, if you have loaded a roll of ISO 200 film, move the dial to "200." Repeat this process using the Booster's shutter speed selector dial.
3. Place the finder over the top of the camera, so the milky white focusing screen is covered. Push down on the Booster until it clicks securely in place.
4. Move the Booster's metering switch, located on the right side of the finder, to the "On" position.
5. Rotate the Booster's shutter speed selector dial to any of the orange numbers --- these represent the slow speeds, measured in seconds. The white numbers represent the fast speeds, measured in fractions of a second. For example, the orange "3" indicates three seconds while the white "15" indicates 1/15 of a second.
6. Compose your picture by looking through the viewfinder. Begin metering the light by turning the small knob near the viewfinder window to the "C" (close) setting. For stopped-down metering, which measures the light while the aperture blades are closed to your chosen opening (f/4, 5.6 and so forth), push the lever on the right of the camera's body toward the lens.
7. Attain proper exposure by aligning the meter's needle and the camera's aperture needle in the viewfinder. Rotate the aperture ring or shutter speed dial to achieve alignment, and thus proper exposure.
8. Press the shutter button to take the photograph. Repeat these steps as the lighting conditions change.
Tags: shutter speed, selector dial, shutter speed selector, speed selector, speed selector dial
