IMG4264b Camera on scotch mount on tripod (2012-03-29_23-13-42_643)
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Here's how it looks when my Canon T1i + Canon EFS 18-55mm IS lens with the scotch mount is on a tripod. The tangent screw *manually* rotated at 1 rpm is used to drive the two boards apart (at the sidereal rate of 360 deg / 1436 mins). This allows the camera to track celestial objects that move at the sidereal rate (e.g. galaxies, nebulae, stars, planets, and often comets or asteroids). This necessarily requires that the hinge be pointing precisely to the North Celestial Pole. (Picture taken via a cell-phone camera.)
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