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Some modern xenon flash units have the ability to produce a longer-duration flash to permit flash synchronization at shorter shutter speeds, therefore called high-speed sync (HSS). Instead of delivering one burst of light, the units deliver several smaller bursts over a time interval as short as 1/125 of a second.
High-end flash units address this problem by offering a mode, typically called FP sync or HSS (High Speed Sync), which fires the flash tube multiple times during the time the slit traverses the sensor. Such units require communication with the camera and are thus dedicated to a particular camera make.
Generic mode dial for digital cameras showing some of the most common modes. (Actual mode dials can vary; for example point-and-shoot cameras seldom have manual modes.) Manual modes: Manual (M), Program (P), Shutter priority (S), Aperture priority (A). Automatic modes: Auto, Action, Portrait, Night Portrait, Landscape, Macro. A dial with more modes
Taken with maximum aperture at day time without flash. Details: F-stop: F/3.5 (Max aperture), Exposure time: 1/50 sec, ISO speed: 200, Focal Length: 18 mm, Flash fired: No, White Balance: Auto, Shot at day or night: Day time Vignetting results when this lens is used on a 35mm film camera, or on a full-frame/FX-sized digital camera.
The original camera was released with some incremental improvements (such as a higher flash-sync speed) in 1984, and this later version is commonly referred to as the FM2n (for 'new', due to the N preceding the serial number on the rear of the top plate), although both versions are labelled as the FM2 on the front of the camera body.
The AE mode itself was unusual. The camera operated with only 3 possible apertures, f/2.8, f/5.6 or f/11, and would use shutter speeds from 1/30 to 1/1000 sec. in 1/3 light value steps. A f/1.8 lens would have full light strength in the viewfinder, but at exposure the max. aperture would be f/2.8.
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Portrait, Sports action, Sunset, Night portrait, Text ... Flash-sync speeds ... (Ultra High Speed) continuous-advance movie mode: Number of recorded pixels: 640 × ...