NOMENCLATURE

1Repere de focale/ouverture

2Echelle des distances

3Repere des distances

4Echelle de compensation infrarouge

5Bague de mise au point

6Echelle des focales

7Bague de zooming

8Index de servocommande diaphragme

9Fourchette de couplage du posemetre

10Lecture directedu diaphragme

11Coupleurdel'ouverturepour flash SB-E Nikon

12Echelle des ouvertures

13Index de couplage photom§trique

14Bague de diaphragme

AVANT-PROPOS

Cet objectif de 25 ~ 50mm f/4 est un zoom de type retrofoyer se composant de 11 lentilles groupees en 10 groupes. S'il possede tous les aspects prati- ques qui caracterisent un grand angle de 25mm, il permet egalement un zooming continu jusqu'a 50mm. Grace a sa construction et a sa conception particulieres, les aberrations telles que la distorsion due au tube de I'objec- tif, un probleme commun a tous les zooms grand angle, ont ete corrig6es. Les performances de ce zoom sont similaires a celles d'objectifs a focale fixe en ce qui concerne clarte" et definition, et ce, sur toute sa gamme de focales. Le zooming et la mise au point s'effectuent s^parement a I'aide de bagues individuelles. La distance minimum de mise au point est de 0,6m. Les surfaces de lentilles exposees a I'air ben^ficient du traitement integre Nikon multi-couches, qui permet de reduire la reflexion tout en minimisant les taches ou les images parasites dues a une reflexion. Le contraste et le rendu des couleurs en sont sensiblement ameliores. Cet objectif convient non seulement a la photographie de reporlage, mais egalement a la photo- graphie generate.

MONTAGEA

Alignez le repere d'ouverture avec le repere de fixation de I'appareil, engagez I'objectif dans la monture baionette puis tournez celui-ci dans le sens horaire inverse jusqu'a son complet verrouillage. Pour le retirer, appuyez sur le bouton de deverrouillage de I'objectif et tournez I'objectif dans le sens des aiguilles d'unemontre.

Lorsque vous montez I'objectif sur un boftier dote d'un levier de couplage diaphragme/posemetre (Al), assurez-vous que ce dernier est correctement positionne. Si au contraire vous fixez cet objectif sur un boftier ne benefi- ciant pas de ce systeme de couplage (de type autre que Al), le couplage doit obligatoirement etre effectue" a la main. Dans le premier comme dans le second cas, referez-vous au mode d'emploi du boitier.

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Nikon Zoom-Nikkor 25-50mm f/4 instruction manual Avant-Propos, Montagea
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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.
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