Leçon 10 de 27
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La loi du carré inverse

“La lumière est le moyen qu’utilise la nature pour véhiculer l’énergie à travers l’espace. La lumière voyage très rapidement, mais sa vitesse est limitée. Rappelez-vous, la prochaine fois que vous regarderez un magnifique lever ou coucher de soleil, que le soleil est en fait passé sous l’horizon huit minutes plus tôt – c’est le temps qu’il faut à la lumière pour atteindre la Terre !”

Voilà une information plutôt cool sur le coucher de soleil qui se produit huit minutes avant qu’on le voie !
Mais voici ce que je veux vraiment que vous compreniez de cette citation :
Nous savons tous que la lumière a une intensité spécifique et que l’intensité peut être modifiée (pensez à un variateur de lumière).

Il y a beaucoup de charabia scientifique sur l’intensité de la lumière. Mais en tant que photographes, nous n’avons pas besoin de savoir cela. Tout ce qu’il faut savoir, c’est qu’il existe une lumière vive et une lumière faible.
C’est à peu près tout ce qui compte vraiment.

Mais ce point de la citation ci-dessus est très importante !
“La lumière voyage très rapidement, mais sa vitesse est limitée.”

Ce que cela signifie (pour vous) c’est que la lumière que vous envoyez pour éclairer 
votre sujet (par exemple à partir de votre flash) peut s’éteindre avant d’atteindre la cible visée.
Cette affirmation est vraie qu’il s’agisse d’une lumière directe ou d’une lumière que vous avez modifiée.
Avez-vous déjà assisté à un concert et remarqué tous les flashs d’appareils photo qui se déclenchent dans la salle ? 
Ces gens n’auront rien d’autre qu’une photographie de la tête de la personne 
qui est assise en face d’eux.

Pourquoi ? Parce que la lumière a une vitesse définie, et que l’intensité de la lumière ne crée pas assez de vitesse pour conduire les ondes lumineuses sur toute la distance qui sépare ces malheureux photographes de la scène.

Une réponse à “La loi du carré inverse”

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