pour determiner les corrections a apporter aux reglages grace a la ligne de compensation infrarougeen pointilles.

Proceder de la meme maniere que pout I'utilisation des echelles de protorv deur de champ. Amener le repere de la distance preselectionnee (echelle

B)sur la ligne repere de focale et d'ouverture (echelle A). La distance separant cette ligne repere et la ligne en pointilles represents la correction a apporter. Tourner la bague de mise au point de I'objectif dans le sens contraire des aiguilles d'une montre jusqu'a ce que la distance de mise au point pre-selectionnee soit modifiee comme indique par les echelles.

CARACTERISTIQUES TECHNIQUES

Longueur focale: 25 ~ 50mm

Ouverture max): 1/4

Construction optique: 11 lentilles en 10 groupes

Champ angulaire: 80M0' ~ 47c50'

Echelle des distances: Graduee en metres et en feet, de 0,6m (2 feet) a I'infini

Utilisation du zoom: Bague de zooming independante tournant sur un angle de 83°; reperes de reference pour longueurs focales de 25, 28, 35, 40 et 50mm

Mise au point: Bague de mise au point independante tournant sur un angle de-73°30'

Echelle des ouvertures: Graduee de f/4 a f/22 sur les echelles standard et de lecture directe de I'ouverture (ADR)

Diaphragme: Entierement automatique

Mesure de I'exposition: A pleine ouverture; index de couplage photo- metrique interne pour boftiers Al ou fourchette de couplage photo- metrique pour boftiers autres que boitiers Al

Porte-accessoire:D'un diametre de 72mm (P = 0,75mm)

Monture: De type Nikon a baionnette

Dimensions: 75mm+ x 112mm longueur hors tout; 104mm extension de I'embase

Poids: Env. 600g

Accessoires

Bouchon avant d'objectif vissant 72mm

Bouchon arriere d'objectif LF-1

Parasoleil a encliquetage HK-7

Etui rigideCL-15S

Pochette souple N° 62

Filtres 72mm

Teleconvertisseur TC-200

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Image 19
Nikon Zoom-Nikkor 25-50mm f/4 instruction manual Caracteristiques Techniques, Longueur focale 25 ~ 50mm Ouverture max 1/4

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.