Astrophotography presents many unique challenges and rewards. A few astronomical objects and events are observable during the day or can be photographed with wide angle lenses, but most have a small angular size and are so dim that they are visible only at night. When photographing such dim and distant subjects, good high resolution optics, fast film, a long focal length, and a large aperture are advantageous. This usually implies the use of a large telescope, but there are ways to get relatively good images with a small telescope. Selection of a good observation site is also important, because city lights, clouds, or fog can wash out or obscure one’s view of the night sky.
KeywordsPrimary Mirror Celestial Object Secondary Mirror Effective Focal Length Drive Rate
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