Experiencing a seemingly supernatural Moon in your snapshots? Here's the explanation behind it and potential solutions
Solving the Problem of 'Ghost' Images in Lunar Photography
Photographing the Moon can be a captivating experience, but sometimes, it results in unwanted 'ghost' images. These 'ghost' images, also known as Streulichtreflexionen or Linsenreflexe, are a common issue in astrophotography.
The solution to this problem depends on the setup used for capturing lunar images. One possible approach is to use a camera with a standard or telephoto lens. However, it's essential to note that wide-field lenses are particularly prone to causing ghost images.
Each glass surface on the lens elements in these lenses can cause unwanted internal reflection. This can build up and create multiple offset images when photographing a bright subject like the Moon against a dark background.
To reduce the effect of these ghost images, several strategies can be employed. A higher magnification (longer focal-length lens) can help reduce the problem. If using a telescope as a lens, ensure all internal surfaces are dark, and there are no shiny features that can cause internal reflections.
Lenses with good anti-reflection coatings can also help reduce the effect of ghost images. Unwanted internal reflection can be minimised by using a lens hood or a lens cap during the exposure. Another effective method is stopping the camera lens down (lengthening the exposure) or using a different lens or telescope.
If flocking a telescope is necessary to reduce ghost images, refer to Steve Richards' quick guide for more information. Astrophotographers are encouraged to send their images for potential publication on the website.
It's important to note that these 'ghost' images are not related to the existence of Earth's second satellite. They are simply a trick of light. The Moon can appear as a 'ghost' image off to one side in photographs, with some of these offset images being the right way round, while others will mirror the main subject.
While the author of a swift-acting guide to handling this issue with spurious 'Ghost' images in lunar photography remains unknown, several experts in the field can provide valuable insights. These include Michael Covington, Stefan Seip, Rüdiger Gersdorf, and Michael Risch.
For further research, if you have the article at hand, look for the author's name, which is often mentioned at the beginning, end, or in the sections 'Weitere Literatur' or 'Empfohlene Lektüre'. If the article is available online, a search engine with the title fragment may also prove helpful.
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