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Mon appareil photo > Objectifs
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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 focale minimum à
longueur focale maximum de l'objectif.
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. 105)
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.
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
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