Orion Unfocused

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In this star trail photo of the belt and sword of Orion, the lens focus was gradually changed during the 10-minute exposure. This technique makes the star colors easier to see, because it spreads the light from each star out over an area of the film, rather than overexposing one point. In this region of the sky, we see that the predominant star color is blue -- this indicates hot, young stars. The conspicuous pink streak is not a star, but is the Orion Nebula, a cloud of reddish-glowing hydrogen gas.

Date: March 12, 2005
Time: 8:47 p.m. to 8:57 p.m. MST
Location: near Florence, Arizona
Camera: Olympus OM-1 35mm SLR on fixed tripod
Film: Fuji Provia 100F slide
Focal length: 200 mm
Aperture: f/4
Exposure time: 10 minutes
Scanner: Nikon Coolscan LS-2000

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Revised: April 2, 2005
Copyright © 2005 Joe Orman
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