{"id":47772,"date":"2023-07-29T11:37:58","date_gmt":"2023-07-29T11:37:58","guid":{"rendered":"https:\/\/www.skyatnightmagazine.com\/?p=120715"},"modified":"2023-07-29T12:32:33","modified_gmt":"2023-07-29T12:32:33","slug":"using-an-h-alpha-filter-for-photographing-the-moon","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/using-an-h-alpha-filter-for-photographing-the-moon\/","title":{"rendered":"Using an h-alpha filter for photographing the Moon"},"content":{"rendered":"

Should you use a hydrogen alpha filter to image the Moon, and what effect will it have on the final photo? <\/p>

By Pete Lawrence\n \t\t<\/p>

Published: Saturday, 29 July 2023 at 11:36 AM<\/p>

\n\n

Hydrogen alpha (H-alpha) is the name given to a particular emission line of hydrogen centred on the wavelength of 656.3nm.<\/p>\n

Since much of our Universe is composed of hydrogen, tuning into this light allows us to concentrate on what is going on in the sky without distraction from other wavelengths.<\/p>\n

The Sun is a bright emitter of H-alpha radiation and the Moon reflects a fair amount of that back to Earth.<\/p>\n

There are different types of H-alpha filter.<\/p>\n

Those used to view the drama that unfolds within the solar chromosphere have a very small passband (the range of wavelengths allowed to pass through), typically one angstrom (10^{-10<\/sup>m) or less.<\/p>\n}