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- Open Flash
- Refers to firing a flash unit with the shutter open. In long time exposures (at Bulb or Time setting), repeatedly firing a the flash creates a multiple-exposure, stroboscopic effect.
- Orthochromatic Filter
- A green or yellow-green filter used with black-and-white film, it compensates for the difference between the color sensitivity of film and the relative luminous efficiency of the human eye for more natural-looking pictures.
- Overexposure
- The result of the film or sensor receiving too much light.
- Overlap Servo
- An autofocus method that provides continuous focus detection and calculation as the lens is being driven, allowing you to perform faster, more precise autofocusing, especially with moving subjects.