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Concepts de photographie
Corrélation entre la longueur de focale,
l’angle et la perspective
La distance focale, exprimée en millimètres, correspond à la distance
séparant le milieu de l’objectif du foyer de mise au point. Elle influe
sur l’angle et la perspective des images capturées. Une distance
focale courte génère un angle de vision étendu, ce qui permet de
photographier un plan large. Une distance focale longue génère un
angle de vision 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 différences.
Angle 20 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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