Omegon Filters UHC filter, 1.25“
The operation of a UHC filter is very simple. Filters sky brightness due to artificial light. Since many celestial objects, such as nebulae, radiate in other wavelengths, this can achieve a considerable increase in contrast. The background sky appears darker and faint details suddenly become visible. Observing first without and then with a UHC filter makes the presence of an object very obvious.
Using a UHC filter is not only useful on sites with light pollution; contrast is also increased at dark sky sites. Many objects only become visible for the first time when a UHC filter is used. But also, highlights like the Orion, Lagoon or Swan nebulae show a whole new side of them.