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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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