Nomenclature, Foreword, Mountinga | Nikon Zoom-Nikkor 25-50mm f/4

NOMENCLATURE

1	Focal Length/Aperture Index	9	Meter Coupling Shoe
2	Distance Scale	10 Aperture-Direct-Readout Scale
3	Distance Scale Index Line	11 Aperture Indexing Post for Nikon
4	Infrared Compensation Scale		SB-E Speedlight
5	Focusing Ring	12	Aperture Scale
6	Focal Length Scale	13	Meter Coupling Ridge
7	Zooming Ring	14	Aperture Ring
8	EE Servo Coupling Post

FOREWORD

This 25-50mm f/4 lens is a retro-focus zoom lens featuring 11 elements in 10 groups. It offers the benefits of a wide-angle 25mm lens with continuous zooming up to 50mm. It is well constructed and designed to correct all aber- rations, especially barrel distortion which is a common problem in wide-angle zoom lenses. Although a zoom lens, its optical performance will challenge that of fixed focal length lenses for sharpness and image clarity throughout its entire focal range. Both zooming and focusing are accomplished through two independent rings—minimum focusing distance is 0.6m, Multilayer Nikon Integrated Coating on all air-exposed lens surfaces helps reduce reflection, thus minimizing flare and ghost to insure greater image contrast and color rendition. Among the applications best suited for this lens are press photog- raphy and general subject shots.

MOUNTINGA

Position the lens in the camera's bayonet mount, aligning the aperture index of the lens with the mounting index of the camera. Twist the lens counterclockwise until it clicks into place. To remove, depress the lens release button on the camera body and twist the tens clockwise.

When mounting the lens on the camera with a meter coupling lever (Al type), make sure that the camera's meter coupling lever is correctly positioned; when mounting on a camera without this lever (non-AI type), "manual" maximum aperture indexing is required. In both cases, refer to the camera's instruction manual.

FOCUSINGB

To focus, rotate the focusing ring until the image in the viewfinder appears sharp and crisp. Once your subject is in focus, you are then ready to zoom. The subject will remain in focus throughout the entire zoom range. For pinpoint focusing, use the maximum focal length and then reduce the focal length for the desired picture composition.

You can prefocus the lens by using the distance scale markings which are engraved, both in meters and feet, on the focusing ring. Turn the focusing ring

Zoom-Nikkor 25-50mm f/4 specifications

The Nikon Zoom-Nikkor 25-50mm f/4 is a versatile and compact zoom lens that has become a favorite among both professional photographers and enthusiasts. It was released in the 1970s as part of Nikon's F series lenses, designed primarily for 35mm film cameras but remaining popular in the digital age with compatible DSLR and mirrorless systems.

One of the standout features of the Nikon Zoom-Nikkor 25-50mm f/4 is its constant maximum aperture of f/4 throughout the zoom range. This capability ensures consistent exposure settings and depth of field control, making it an excellent choice for varied shooting conditions. The lens covers a wide focal length range, from a moderately wide 25mm to a standard 50mm, enabling photographers to capture a variety of scenes—from expansive landscapes to intimate portraits.

The lens incorporates several advanced optical technologies designed to enhance image quality. The construction includes multiple elements arranged in groups, effectively minimizing distortion and aberrations typically associated with zoom lenses. Nikon's proprietary Super Integrated Coating (SIC) further reduces flare and ghosting, resulting in impressive color accuracy and contrast.

Another significant characteristic of the Zoom-Nikkor 25-50mm f/4 is its compact and lightweight design. Weighing merely 600 grams, it offers portability without sacrificing durability. The lens barrel is made from high-quality materials, ensuring reliability in various shooting environments. The design also features a smooth zoom mechanism that allows for precise framing adjustments.

Focusing is made easy with the lens's close focusing capability, allowing for effective close-up work. The focus ring operates smoothly, allowing photographers to fine-tune their shots accurately. Additionally, the lens is compatible with Nikon's extensive range of accessories, including filters and hoods, enhancing its versatility.

In conclusion, the Nikon Zoom-Nikkor 25-50mm f/4 remains a trusted companion for photographers seeking a reliable zoom lens that combines excellent optical performance with practicality. With its constant aperture, superior coating technologies, and robust design, it is a perfect choice for anyone wanting to explore the art of photography, making it an enduring classic in the world of photography lenses.