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Do You Have A Scope?
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Daniel Johnson on April 20, 2003 03:26:29 UTC |
If you use an ordinary 35mm camera with a 50mm focal length lens, you can use that lens on a fixed tripod for exposures of 15 or 20 seconds before the stars start to streak from Earth's rotation. For a typical ISO400 film, that will catch a lot of visible stars but not much nebulosity. If you have any way to piggyback your camera on a motorized, polar-mounted telescope (even a low-quality scope), you can extend that time to a few minutes without guiding, if your polar alignment is within a mile of being right. With your 50mm lens opened to, say, f/2 or so, a 3-minute exposure of the summer Milky Way near the tail of Scorpius will make your neighbors gasp and think you're a genius.
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