Abstract
A neutral filter used to reduced the brightness of the Moon (it must not be used for solar observing). It is formed from two Polaroid sheets whose angle may be varied so that the transmission can vary between 0 and 50%.
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© 2002 Springer-Verlag London
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Kitchin, C. (2002). V. In: Illustrated Dictionary of Practical Astronomy. Springer, London. https://doi.org/10.1007/978-1-4471-0175-8_22
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DOI: https://doi.org/10.1007/978-1-4471-0175-8_22
Publisher Name: Springer, London
Print ISBN: 978-1-85233-559-5
Online ISBN: 978-1-4471-0175-8
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