Leica SF 24D electronic flash unit is designed to be compact, but also to provide the maximum distance between the flash reflector and the camera lens, which minimizes the risk of red eye when photographing people or animals. With the Leica R8/R9 the light output is controlled by the internal TTL flash exposure meter; with other Leica R models it is controlled by the automatic flash itself. In automatic mode, six auto-flash apertures, 2.0/2.8/4.0/5.6/8/11, are available. An override switch of this camera accessory by Leica allows the exposure to be varied by plus/minus three f/stops. All the settings and other items of information are easily readable off the Leica SF 24D's illuminated LCD display, including a flash confirmation checker and flash ready light, which are simultaneously displayed in the viewfinder of the R8/R9 by Leica.
The ISO film-speed settings range from ISO 12 to ISO 3600 in M/TTL range and from ISO 25 to ISO 800 in A mode. The illumination angle corresponds to a focal length range of 35 to 85 mm, and can be extended by means of two supplied diffusers, enabling flash exposure with wide-angle lenses down to 24 mm and telephoto lenses up to 135 mm focal length respectively. It's powered by two 3 Volt 123 A lithium batteries providing fast recycling.
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