Mon appareil photo > Objectifs

Marquages de l’objectif

Découvrez ce que les numéros inscrits sur l’objectif signifient.

Objectif SAMSUNG 18-200 mm F3.5-6.3 ED OIS (exemple)

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N°.

Description

 

 

Valeur d’ouverture

1Gamme de valeurs d’ouverture acceptées. Par exemple, 1:3.5–6.3 correspond à une gamme de valeurs maximale d’ouverture allant de 3,5 à 6,3.

Longueur de focale

Distance entre le centre de l’objectif et son point focal

(en millimètres). Ce chiffre est exprimé en tenant compte des aspects

2suivants : valeur entre la longueur de focale minimum et maximum de l’objectif.

Des longueurs de focales plus importantes réduisent les angles de vue et agrandissent le sujet. Des longueurs de focales moins élevées agrandissent les angles de vue.

ED

ED signifie Dispersion extra faible. Un verre à très faible dispersion

3assure une excellente correction de l’aberration chromatique (déformation qui se produit lorsqu’un objectif ne parvient pas à mettre au point toutes les couleurs vers le même point de convergence).

OIS (p. 71)

4Stabilisation optique de l’image Les objectifs bénéficiant de cette fonction détectent les mouvements internes de l’appareil photo et les suppriment efficacement.

Ø

5Diamètre de l’objectif. Assurez-vous que le diamètre des filtres que vous fixez sur l’objectif soit égal au diamètre de ce dernier.

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Samsung EV-NX1100BSBFR, EV-NX1000BUBFR manual Marquages de l’objectif, Objectif Samsung 18-200 mm F3.5-6.3 ED OIS exemple
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