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Stars - The Southern Cross - Alpha and Beta of Centaur - Southern Cross and...

IMAGE number
PIX4581409
Image title
Stars - The Southern Cross - Alpha and Beta of Centaur - Southern Cross and pointers - Star trails - Because of the Earth's rotation, leaving the camera open, the stars advance towards the background of the sky. During the installation, gradually changing the focal length of the lens, the stars spread out and reveal their true color. Here, the constellation of the Southern Cross and the Alpha and Beta stars of the Centaurus, on the left, are photographed this way during a 40mn pose. Star images are point sources of light of widely varying intensity. Normally, no single photographic exposure on colour film can capture their subtle colours. Those stars whose intensity is just right for their colour to be recorded appear insignificant on the photograph, while anything brighter is overexposed and washed out. By changing the focus of the lens during a star trail exposure, star images are spread out over the film surface. This effectively changes the amount of light in each star image as well as making it bigger. If this is done in a series of steps, as here, sooner or later all the star images will be recorded with an exposure that will reveal the star colours. Here we see the stars of the Southern Cross and pointers (alpha and beta Cen) recorded in an exposure of about 40 minutes, during which the lens focus was moved from infinity to about 2m in six steps five minutes apart
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Image description

Stars - The Southern Cross - Alpha and Beta of Centaur - Southern Cross and pointers - Star trails - Because of the Earth's rotation, leaving the camera open, the stars advance towards the background of the sky. During the installation, gradually changing the focal length of the lens, the stars spread out and reveal their true color. Here, the constellation of the Southern Cross and the Alpha and Beta stars of the Centaurus, on the left, are photographed this way during a 40mn pose. Star images are point sources of light of widely varying intensity. Normally, no single photographic exposure on colour film can capture their subtle colours. Those stars whose intensity is just right for their colour to be recorded appear insignificant on the photograph, while anything brighter is overexposed and washed out. By changing the focus of the lens during a star trail exposure, star images are spread out over the film surface. This effectively changes the amount of light in each star image as well as making it bigger. If this is done in a series of steps, as here, sooner or later all the star images will be recorded with an exposure that will reveal the star colours. Here we see the stars of the Southern Cross and pointers (alpha and beta Cen) recorded in an exposure of about 40 minutes, during which the lens focus was moved from infinity to about 2m in six steps five minutes apart

Photo credit
Photo © David Malin Images/Novapix / Bridgeman Images
Image keywords
astronomy / color / star / constellation / astronomy / crude / 1985 / star / Novapix / astronomy / Star Sky / starry sky / South Hemisphere / southern hemisphere / Star Line / star trails / Centaurus Alpha / southern cross / alpha centauri / southern cross / color

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Asset - General information
Largest available format 3366 × 2681 px 2 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3366 × 2681 px 285 × 227 mm 2.0 MB
Medium 1024 × 816 px 87 × 69 mm 1.0 MB

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