曝光係數, 128 | Nikon AF-S specs

8.曝光係數

鏡頭上的f值表示在鏡頭設定為“無限遠”拍攝距離時所攝取的影像亮度。重現比率越高，影像的亮度便會越低。影像的真實亮度數值便是一般所謂的“有效f值”，而會跟著有效f值變更而改變的曝光補償值則被稱為“曝光係數”。

9.有效f值的改變（在第146頁）

此鏡頭隨重現比率越高，菲林（影像感應裝置）上的影像亮度便會降低，而有效的f值也會提高（通過鏡頭光圈的光線數量將會降低）。此變化會由相機的曝光錶自動補償，因此使用者可以決定曝光值或使用TTL閃光燈拍攝功能，不需要考慮曝光係數。

相機LCD面板或取景器中顯示的f值便是自動補償後的數值。

10.光圈設定

在相機機身上設定光圈。當曝光（或拍攝）模式設定為“A”（光圈優先自動）或“M”（手動）時，相機會控制預先決定的f值（最高約為1.6檔）保持不變，而有效的f值隨拍攝距離變化。

128 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.

Nikon AF-S user manual 曝光係數, 128

Models: AF-S

8.曝光係數

9.有效f值的改變（在第146頁）

128

AF-S specifications