8.曝光比例

镜头上的f值表示在镜头设定为“无限远”拍摄距离时所摄取的影 像亮度。成像比率越高，影像的亮度便会越低。影像的真实亮度 数值便是一般所谓的“有效f值”，而会跟着有效f值变更而改变的 曝光补偿值则被称为“曝光比例”。

9.有效f值的改变（在第146页）

此镜头随成像比率越高，胶片（影像感应装置）上的影像亮度便 会降低，而有效的f值也会提高（通过镜头光圈的光线数量将会降 低）。此变化会由相机的曝光测光进行自动补偿，因此使用者可 以决定曝光值或使用TTL闪光灯拍摄功能，不需要考虑曝光比例。 相机LCD面板或取景器中显示的f值便是自动补偿后的数值。

10.光圈设定

在相机机身上设定光圈。当曝光（或拍摄）模式设定为“A”（光 圈优先自动）或“M”（手动）时，相机会控制预先决定的f值 （最高约为1.6档）保持不变，而有效f值随拍摄距离变化。

Ck

116

Page 115 Page 117
Page 116
Image 116
Nikon AF-S user manual 曝光比例, 116
Page 115 Page 117

AF-S specifications

The Nikon AF-S 35mm f/1.4G lens is a highly regarded prime lens designed for Nikon’s FX-format (full-frame) and DX-format (crop sensor) cameras. Known for its exceptional optical performance and versatility, the lens is a popular choice among professional photographers and serious enthusiasts.

One of the standout features of the AF-S 35mm f/1.4G lens is its large maximum aperture of f/1.4. This wide aperture allows for outstanding low-light performance, enabling photographers to capture sharp images even in dimly lit environments. The lens also provides beautiful background bokeh, making it ideal for portraiture and street photography, where subject isolation is desired.

The optical construction of the lens consists of 11 elements in 9 groups, which includes two aspherical lens elements. These aspherical elements help to minimize optical distortions and ensure that image quality remains consistent across the frame. The lens also incorporates Nikon's Super Integrated Coating (SIC), which enhances light transmission and reduces flare and ghosting, resulting in improved contrast and color accuracy.

An essential characteristic of the AF-S 35mm f/1.4G is its Silent Wave Motor (SWM) technology. This innovative motor provides fast, quiet, and precise autofocus capabilities, allowing photographers to lock onto subjects with ease. The lens also features a focus switch that enables seamless switching between automatic and manual focus modes, granting photographers full control over their shooting experience.

Durability is another significant aspect of the lens’ design. The AF-S 35mm f/1.4G features a weather-sealed construction, making it a reliable choice for outdoor photography, even in challenging weather conditions. The lens is designed to withstand dusty environments and moisture, ensuring longevity and performance in a variety of scenarios.

Additionally, the lens has a filter diameter of 67mm, making it compatible with a range of filters such as polarizers and ND filters to enhance creative possibilities. Weighing approximately 600 grams, the lens strikes a balance between portability and robust build quality, making it an excellent companion for various photography styles.

Overall, the Nikon AF-S 35mm f/1.4G lens is a remarkable choice for photographers seeking a high-performance prime lens. Its superb optical quality, fast autofocus, and durable design make it a reliable option for a wide range of photographic applications, solidifying its position as an essential tool in the arsenal of many professionals.
Top Page Image Contents