Olympus iS-3 DLX Instructions Manual
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FLASHFlash StrengthThe flash on the IS-3DLX employs a new exposurecontrol system that combines the advantages ofboth "flashmatic," used in compact cameras, and"auto flash," found in SLR cameras. Flashmaticemits a full-strength flash while automaticallyadjusting the aperture for proper exposure. Thissystem is effective in most cases. However, subjectsat extremely close range tend to be overexposed,and the background too dark, because thenarrowest aperture setting has been selected. Autoflash varies the amount of light emitted by the flash,and sets the exposure by measuring reflected light.Depending on the background, however, the wrongexposure for the main subject can be selected. Forexample, with a white background, the subject mayappear too dark due to the level of reflected lightreceived through the lens. The reverse is true for adark background.The IS-3DLX adjusts both the aperture and flashstrength to give you perfect exposure every time,taking into account the effect of the backgroundlight and the distance to the subject.Dual-Strobe Intelligent FlashThe flash of the IS-3DLX is distinguished by twoemission tubes. One of the most important functionsof a flash is to distribute light evenly throughout theframe. When a zoom lens is used, the area that canbe lit by a single flash is determined by the wide-angle focal length. When telephoto is used, the lightis wasted because the light is spread over a widearea. If this wasted light is concentrated on thepicture area, however, the working distance of theflash will be increased. Solving this problem iscrucial to effective telephoto-flash photography.The zoom flash system found in some cameras isone solution to this problem. With this system, thedistance between the xenon tube — which is theemission source of the flash — and the reflectivematerial behind it is varied according to the focallength of the lens. When telephoto is used, the lightfrom the flash is condensed more intensely. (Thedistance between the xenon tube and tnecondenser lens can be varied for the same result.)So why does the IS-3DLX incorporate the dual-strobe system? Because the dual-strobe system canutilize the light more effectively while achieving moreuniform lighting than the zoom flash system iscapable of. The zoom flash system also cannot alterthe actual shapes of the reflector and the condenserlens. In practice, these two factors greatly affect theeven distribution and condensing intensity of lightfrom the flash. The zoom flash sacrifices theeffective use of the light's intensity for evendistribution. To achieve both optimal condensingintensity and even distribution, Olympus developedthe dual-strobe flash system with two sets of tubesand a reflective backing that are ideal for both wide-angle and telephoto photography. This makes apowerful, versatile flash with GN 28(130 100·m)/GN 92 (ISO 100·ft)possible.63TAKING BETTER PICTURES |
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