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Piggyback Camera
[ Piggyback Camera ]

·Astronomy: Piggyback Camera - THE PIGGYBACK PLATFORM
·Astronomy: Piggyback Camera - GUIDING OUT ERRORS
·Astronomy: Piggyback Camera - FILM AND EXPOSURES
·Astronomy: Piggyback Camera - Alignment-PRECISE ALIGNMENT
·Astronomy: Piggyback Camera

  Lunar Eclipse: Astronomy: Lunar Eclipse - Eclipse Photo
Posted on Saturday, December 04 @ 15:33:57 CST by astronomy
  Lunar Eclipse


As a lunar eclipse progresses, viewers with binoculars and telescopes watch the Moon closely, timing when the shadow reaches individual craters and then estimating how dark the eclipse is. Other observers get a camera, put it on a tripod, and take scenic shots of the dark, copperyMoon in the sky.

Some photographers piggyback the camera on an equatorially mounted telescope. With the telescope tracking the stars, they take a multiple exposure that capture the Moon in stages as it move through Earth's shadow.

Another popular multiple-exposure photograph that is even easier to take is to frame the Moon in the sky next to a tree or building in the foreground. Then, without moving the camera or changing its aim), you take a series of identical exposures, precisely or 10 minutes apart. The result will be a striking scenic view with a number of Moons marching across the sky, changing color and brightness as the eclipse progresses.

With ISO 200 film, you can capture the partial phases with a 1/60 second exposure at t/8. During totality, use 2 seconds at f/4. If the eclipse seems especially dark, you should double (or even quadruple) the exposure. Because it is so hard to guess the Moon's brightness ahead ot time, you should plan to take a range of exposures. Make one shot at the "normal" exposure, followed by one .it twice that exposure, and a third at four times the normal exposure. At least one of the frames should come out just right.

As the Moon dwindles in brightness during the eclipse, beautiful star fields all over the sky become more prominent. Tills effect is strongest for observers at dark sites well away from light pollution.




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