The Vespera light pollution filter or CLS (City Light Suppression) filter improves photo quality when observing in the city or suburbs. It attenuates the effects of light pollution, enhancing the contrast between the celestial object photographed and the background sky.
The broadband filter blocks the Na (sodium) and Hg (mercury) wavelengths mainly emitted by urban night lighting or undesirable natural light (atmospheric oxygen radiation...), while retaining the main wavelengths emitted by celestial objects.
This accessory is particularly useful for enhancing the luminosity of deep-sky objects: nebulae, star clusters, galaxies... Its effectiveness is optimal on emission nebulae because of the filtered wavelengths.
Examples of nebulae in emission : Bubble (NGC 7635), Crescent (NGC 6888), Eagle (M16), Elephant's Horn (IC 1396), Flame (NGC 2024), Lagoon (M8), North America (NGC 7000), Omega (M17), Orion (M42), Pacman (NGC 281), Rosette (NGC 2237), Tarantula (NGC 2070), Thor's Helmet (NGC 2359), Trifid (M20), Tulip (Sh2-101).
Designed specifically for the Vespera lens, it fits easily and discreetly into the optical arm. The lens ring that holds the CLS filter is equipped with an electronic card that enables Vespera to detect it.
The filter is supplied in a transparent storage box.
