Polarising filters (polarising filters for short) play an important role in astronomy, especially in the observation of celestial bodies and certain phenomena. A polarising filter is an optical filter specially designed to block or enhance certain polarisation properties of light.

Polarised light oscillates in a certain plane, while unpolarised light oscillates in different directions. A polarising filter only allows light in a certain plane of vibration to pass through and blocks light in other planes of vibration. By turning the polarising filter, the desired polarisation can be selected.

In astronomy, polarising filters are used in various situations. A common application is the observation of reflection nebulae, where the light from stars is scattered by dust and gas clouds. A polarising filter can help increase the contrast between the nebula and the surrounding sky by reducing the scattered polarised light.

Polarising filters can also be used to make surface details of planets more visible. The light reflected from planetary surfaces is often partially polarised. By using a polarising filter, the polarised light can be filtered out, which can lead to improved visibility of structures on the planet's surface.

In addition, polarising filters can also be used when observing the Sun. When observing the sun, they can help reduce glare and make details such as sunspots more visible.

However, it is important to note that polarising filters are not useful in all situations. They are usually not useful when observing diffuse objects such as galaxies or star clusters, as these objects do not usually emit polarised light.

Overall, polarising filters in astronomy offer a way to improve the contrast and visibility of certain objects by filtering the polarised light. Their application depends on the specific observing situation and the object to be observed.

Scope of delivery

• Polarising filter
• Storage box