Photographed by Scott Davis on August 10, 2013
From Ahwahnee Hills Observatory
This star trail image is unique because, instead of being taken with a wide-field lens, it was taken with a 300mm telephoto lens. Because of this, it can now easily be seen that Polaris, the brightest star in the field of view, is not quite aligned with the celestial north pole (though it is certainly close enough for most purposes, including navigation). Though the camera was on a sturdy tripod for the entire exposure, the occasional gusts of wind definitely had an impact on the star trails themselves.
Canon EOS Digital Rebel XT
Canon EF 300mm f/4.0L IS USM
Camera settings were ISO 100, f/8, with a 3-hour exposure. In-camera dark frame subtraction was turned on.
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