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Split shots - images air-mer

29/8/2012

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Taking pictures in two different environments is no easy task, given their very different densities. Air at 15 to 20 degrees C has a density of 1.2 kg per cubic metre. Water at the same temperature has a density close to 1000 kg per cubic metre, making it 784 times denser. This makes water absorb light much more than air and creates an imbalance where split shots often have one half well-exposed and the other half either under-exposed (the water) or over-exposed (the air).
The images above were taken at Ile de Sein, a tiny island of 130 inhabitants off the northwesternmost tip of France. 
To achieve the right exposure both above and belows the waterline, i used two Inon S2000 strobes at full power, with a narrow (high number) aperture setting to compensate for the relatively slow shutter speed imposed by the use of flash. Using a narrow aperture, more of the image was in focus, both the rock in the foreground about a metre from my lens, and the houses in the background, probably around 100 metres away. On the high-res images I can zoom in and read the sign on the sea wall saying "Quai des Paimpolais".
La prise de photo en deux environnments differentes n'est pas facile, a cause de leurs densités bien distinctes. L'air a une densité de 1,2 kg / metres cube a 15 a 20 degrés. L'eau, a la meme temperature a une densité de 1000 kg/metre cube, 784 plus dense. En consequence, l'eau absorbe la lumiere bien plus que l'air et cree une desequilibre dans l'image avec une partie bien exposé et l'autre soit sous-exposé (l'eau) ou sur-exposé (l'air).

Les images ci-dessus ont été pris devant l'ile de Sein au large de la Pointe du Raz en Bretagne. Pour équilibrer les deux parties, j'ai utilisé deux flashs Inon S2000 a plein puissance, avec une petite ouverture pour compenser la vitesse d'obturation relativement lente imposé par le flash. Avec une petite ouverture, une plus grande partie de l'image est nette, le rocher a un metre de l'objectif et les maisons a environ 100 metres. Sur les images haute résolution, je peux zoomer et lire le panneau "Quai des Paimpolais"sur le mur.
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