Nikon AF-S DX Micro-NIKKOR 85mm f-3.5G ED VR: ■ Exposure factor ■ Effective f-number variation (P. 148)
■ Exposure factor ■ Effective f-number variation (P. 148): Nikon AF-S DX Micro-NIKKOR 85mm f-3.5G ED VR
Table of contents
- Notes on Safety Operations
- ■ Nomenclature
- ■ Major features
- ■ Using the lens ■ Focusing
- ■ Setting the aperture ■ Depth of field ■ Focusing at a predetermined reproduction ratio ■ Notes on close-up photography and reproduction work
- ■ Exposure factor ■ Effective f-number variation (P. 148)
- ■ Vibration reduction mode (VRII)
- ■ The built-in flash and vignetting ■ Using the lens hood
- ■ Lens care ■ Standard accessories ■ Optional accessory
- ■ Specifications
■ Exposure factor
The f-number of a lens indicates brightness of the image formed by the
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lens set at “infinity” shooting distance. The greater the reproduction ratio,
the more image brightness decreases. The actual brightness of the image
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is called the “effective f-number,” and the exposure compensation value
for the change of the effective f-number is called the “exposure factor.”
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■ Effective f-number variation (P. 148)
With this lens, the greater the reproduction ratio (the shorter the
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shooting distance), the more the brightness of the image projected onto
the image sensor decreases and the more the effective f-number
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increases (the amount of light passing through the lens’ aperture
decreases). This variation is automatically compensated for by the
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camera’s exposure meter, so the user can determine exposure or operate
TTL flash shooting without having to consider the exposure factor.
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The f-number displayed in the camera’s LCD panel or viewfinder is the
value automatically compensated.
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