Abstract
In the old days, planets and nebulae were imaged with basically the same equipment; a telescope and a camera. The native focal lengths of even the largest telescopes tended to make planetary images small on film when the camera was placed at the prime focus of the telescope. To overcome this, a technique known as “eyepiece projection” was used to increase the size of the planet’s image on the film. In eyepiece projection, an eyepiece or other lens, is used to project the image of the planet onto the film. This does increase the size of the planetary image, but it also slows down the photographic speed of the system and, coupled with the low sensitivity of film, resulted in planetary images that were often blurred by the seeing so much that most of the detail was lost, even when using large diameter telescopes.
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Jensen, T.J. (2015). Webcam Imaging. In: Budget Astrophotography. The Patrick Moore Practical Astronomy Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-1773-0_5
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DOI: https://doi.org/10.1007/978-1-4939-1773-0_5
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Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4939-1772-3
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