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Mon appareil photo > Objectifs
48
Marquages de l’objectif
Découvrez ce que les numéros inscrits sur l’objectif signient.
Objectif SAMSUNG 18-200 mm F3.5-6.3 ED OIS (exemple)
1
2 3 4 5
Description
1
Valeur d’ouverture
Gamme de valeurs d’ouverture prises en charge. Par exemple,
1:3.5–6.3 correspond à une gamme de valeurs maximale d’ouverture
allant de 3,5 à 6,3.
2
Longueur de focale
Distance entre le centre de l’objectif et son point focal (en
millimètres). Cette valeur est exprimée sous forme de plage
(longueur minimum à maximum).
Des longueurs de focale plus importantes réduisent les angles de
vue et agrandissent le sujet. Des longueurs de focale moins élevées
agrandissent les angles de vue.
3
ED
ED signie dispersion extra faible (Extra-low Dispersion). Un verre à
très faible dispersion assure 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).
4
OIS (p. 83)
Stabilisation optique de l’image. Les objectifs bénéciant de cette
fonction détectent les mouvements internes de l’appareil photo et
les compensent ecacement.
5
Ø
Diamètre de l’objectif. Assurez-vous que le diamètre des ltres que
vous xez sur l’objectif est égal au diamètre de ce dernier.
49


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