Nikon 85mm f/3.5G User Manual - Page 17
Exposure factor, Effective f-number variation P. 148
UPC - 018208021901
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■ Exposure factor The f-number of a lens indicates brightness of the image formed by the lens set at "infinity" shooting distance. The greater the reproduction ratio, the more image brightness decreases. The actual brightness of the image is called the "effective f-number," and the exposure compensation value for the change of the effective f-number is called the "exposure factor." ■ Effective f-number variation (P. 148) With this lens, the greater the reproduction ratio (the shorter the shooting distance), the more the brightness of the image projected onto the image sensor decreases and the more the effective f-number increases (the amount of light passing through the lens' aperture decreases). This variation is automatically compensated for by the camera's exposure meter, so the user can determine exposure or operate TTL flash shooting without having to consider the exposure factor. The f-number displayed in the camera's LCD panel or viewfinder is the value automatically compensated. Jp En De Fr Es Sv Ru Nl It Cz Sk Ck Ch Kr 17