Olympus IS-1 Instructions Manual

Measuring the amount of lightLight meteringLight metering refers to measuring the brightnessof certain parts of a picture. The IS -1 employsthree meterings: (1) ESP light metering, (2) center-weighted average light metering, and (3) spotmetering. According to your photographicpurpose, the IS-1 allows you to select that whichis the most suitable.At the same time, the IS-1 uses TTL (throughthe lens) light metering to automatically measurethe light that enters the lens. This allows you toobtain very accurate light metering without anyinfluence due to distance changes between thesubject and the camera.ESP (Electro Selective Pattern) light metering(Exposure mode P)ESP light metering measures the central portionand peripheral portion of the frame separately.In doing so, the camera determines the properexposure. The calculation processing programitself is based on trial and error data to properlycompensate for backlighting. ESP light meteringtakes place automatically while in P (Program)mode.Center-weighted average light meteringCenter-weighted average light metering is themost widely used light metering system (Fig. A).This system measures light within a wide rangewith special emphasis on conditions in the centerof the picture. When in A (Aperture-preferred) orM (Manual) mode, this light metering systemis automatically activated. Providing that differingcontrast between brightness and darkness in therest of the frame is not tooextreme (a portrait with anextremely bright backgroundfor example) the systemprovides excellent results.Spot meteringSpot metering (Fig. B) measures the brightness inthe central section of the frame only. Because thismetering system calculates the correct exposure ofone point, it is convenient when the subject isbacklit or there is strong contrast in the picture.When shooting a subject in front of an extremelybright background, you should spot meter thesubjects face. To make white objects look very white,use spot metering and then operate exposurecompensation button in the (+) direction.To make black objectslook very black, usespot metering and thenoperate the exposurecompensation button inthe (-) direction.— 59 —