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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.
Video demonstration of high-speed flash photography. A flash is a device used in photography that produces a brief burst of light (lasting around 1 ⁄ 200 of a second) at a color temperature of about 5500 K [1] [citation needed] to help illuminate a scene. The main purpose of a flash is to illuminate a dark scene.
The X-sync speed for flash is 1/55 sec.; flash support was through a PC socket on the front of the body. The viewfinder uses a glass pentaprism and gives coverage of 90% of the frame vertically and 93% horizontally, with a 0.9× magnification (with a 50 mm standard lens). The FP was available with either silver or black metal parts.
The FM2 originally used an advanced Nikon-design, metal-bladed, bearing-mounted, vertical-travel purely mechanical focal plane shutter with a (then unheard-of) speed range of 1 to 1/4000th second plus Bulb, plus a fast flash X-sync of 1/250th second. (Actually the first models were with a flash X-sync 1/200th second.)
Flash; Flash: Onboard pop-up flash; hot shoe for P-TTL flash units with high-speed sync support; PC socket for studio flashes; 1/180 s X-sync speed: Shutter; Shutter speed range: 1/8000 – 30 s, Bulb: Continuous shooting: Up to 8.3 fps for 60 JPEG or 23 raw images: Viewfinder; Viewfinder: Eye-level pentaprism, 100% coverage, 0.95× ...
Like the 380EX, the 420EX did not provide user controls (other than enabling and disabling high-speed sync); any flash-related settings, such as exposure compensation or second-curtain synchronization, had to be set using the body.