Broadband fog filter 2''
Nebulae filters filter out the artificial light pollution of the night sky. The light from celestial objects, on the other hand, is allowed to pass through almost unhindered. The contrast increases significantly.
Visual application
Broadband nebula filters allow slightly more light to pass through. They are slightly brighter and therefore suitable for observation with apertures of 70 mm or more. The impression of the sky remains natural. The number of stars is only slightly reduced. Broadband filters are not only useful for observing planetary nebulae and gas nebulae; they also have a positive effect on galaxies. Of course, the brightness of the galaxy is reduced, but the selective darkening of the sky background still enhances the contrast.
Photographic application
The photographic application with broadband nebula filters makes particular sense. The exposure time is extended by a factor of about 2, but the contrast increases noticeably. This also allows good colour photographs of celestial objects to be taken from near cities.
