Photography gives you a way to record what you see through the telescope. Surprisingly, though, astrophotography does not reproduce what you see visually. In lunar and planetary work, it is very hard to get pictures as sharp as what the eye can see, because the eye can seize moments of atmospheric steadiness in a way that the camera cannot. In deep-sky work, on the other hand, the camera often records far more than the eye could see with the same instrument because film can accumulate light in a long exposure.
This chapter will tell you enough about astrophotography to get you started. It is not a complete guide; for that, see my other book, Astrophotography for the Amateur (Cambridge University Press, 1999).
One word of advice: astrophotography is a matter of skill, not just equipment. It is definitely not a matter of "You press the button, we do the rest" - it is a stiff test of how well you understand your equipment and the principles on which it operates. Never buy a piece of equipment until you know exactly what you'll use it for.
There is also an element of luck. The pictures that you see published in magazines are the work of experienced astrophotographers and are generally the best of many, many tries. Do not expect to equal them immediately.
But some techniques do yield very good pictures even in the hands of a beginner. Piggybacking is one example; so is afocal photography of the Moon (Figure 7.1). It is rewarding to share your pictures with local groups, enter them in art exhibits, and so forth, even if they can't compete with those of the world's top astrophotographers. The beauty of a picture is not proportional to the difficulty of taking it or the cost of the equipment. After years of experience, I keep coming back to the most basic techniques because they are the most satisfying.
In what follows I'm going to assume that you already understand basic photography - how a lens forms an image, how shutters and f-stops control exposure, and how film is developed and printed. If not, some reading is in order.
One of the best guides is Basic Photography, by Michael Langford (ButterworthHeinemann, 2001) and, on a more technical level, The Camera, by Ansel Adams (Bulfinch Press, 1987).
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