Exposure factor, Effective f-number variation P

8. Exposure factor

The f-number of a lens indicates brightness of the image formed by the lens set at “infinity” shooting distance. The higher the

En reproduction ratio is, the more the brightness of the image will decrease. 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.”

9. Effective f-number variation (P. 146)

With this lens, the higher the reproduction ratio is, the more the brightness of the image on the film (image sensing device) will decrease and the effective f-number will increase (the amount of light that comes through the lens´ aperture will decrease). 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.

10. Setting the aperture

Set the aperture on the camera body. When exposure (or shooting) mode is set at “A” (Aperture Priority auto) or “M” (manual), the camera will control to maintain the predetermined f-number (up to approx. 1.6 stops) as the effective f-number varies with shooting distance.

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.