Fog filters

In the Nebular Filters category you will find both broadband filters and line filters . The latter only allow light from certain spectral lines to pass through in a highly selective manner. OIII and H-Alpha filters are especially popular. Many deep sky objects are only seen in all their glory with these filters!
As their name indicates, wide and narrow band filters allow different pass widths of a region of the spectrum. They serve, above all, to suppress annoying light sources.

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