Increase in contrast when observing nebulae

Nebula filters suppress disturbing stray light from cities and increase the contrast of the deep-sky object.
A good nebula filter or city light filter allows observing faint objects close to cities. These filters let the light of the nebulae pass and block the unwanted artificial light.

On this page, you can find, among other things:
UHC filters and CLS filters – universal nebula filters
O-III and H-beta filters
comet filters
narrow band nebula filters for larger telescopes

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