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The Vivitar Model 91 electronic flash c. 1964 is a very reliable and sturdy manual flash unit made by Vivitar Corporation a subsidiary of Ponder & Best, Inc. It has a cold shoe mount and a permanently affixed PC sync cord that connects to a camera's x-sync terminal. An exposure compensation dial mounted on the side is used to quickly determine camera aperture settings based on known film speed and distance to subject. On/off switch and ready light are on the back side.
- Guide numbers:
Kodachrome II (ASA 25): 30 Kodachrome X (ASA 80): 55 Ektachrome (ASA 160): 75
- Recycle time: 4 seconds
- Flash duration: 1/1000 second
- Angle of illumination:
55° horizontal 55° vertical
- Color temperature: 6000° Kelvin
- Power source: Four AA alkaline batteries
- Flashes per set of batteries: 400+
- Weight: 9 ounces
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