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Concepts de photographie
Corrélation entre la longueur de focale, l’angle
et la perspective
La longueur de focale, ou distance focale, exprimée en millimètres, correspond
à la distance séparant le milieu de l’objectif du foyer de mise au point. Elle inue
sur l’angle et la perspective des images prises. Une longueur de focale courte
génère un angle de vue étendu, ce qui permet de photographier un plan large.
Une longueur de focale longue génère un angle de vue étroit, ce qui permet de
photographier au téléobjectif.
Longueur de focale courte
plan large
angle large
objectif angle large
Longueur de focale longue
photo au téléobjectif
angle étroit
téléobjectif
Observez les photos ci-dessous et comparez les diérences.
Angle 16 mm Angle 50 mm Angle 200 mm
En temps normal, un objectif grand angle convient pour réaliser des photos de paysages,
tandis qu’un objectif à angle étroit est recommandé pour les photos d’évènements
sportifs ou les portraits.
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