Omegon Filter Pro Veil H-Alpha OIII 7nm 2''

State-of-the-art interference technology for maximum suppression of stray light
7nm full width at half maximum (FWHM)
For the two brightest emission lines: H-alpha and O-III



Hidden in the light – the colors of emission nebulae

There is a vast amount of light in and around human settlements. This lighting not only helps us find our way in the dark but also brightens the night sky. Faint celestial objects then disappear—obscured by artificial skyglow.

Unlike stellar objects—such as globular clusters and galaxies—or reflection nebulae (like the blue glow surrounding the Pleiades), emission nebulae radiate light in very specific colors. The brightest of these so-called emission lines are:

H-Alpha: 656.3 nm
H-Beta: 486.1 nm
O-III_1: 495.9 nm
O-III_2: 500.7 nm
S-II_1: 671.7 nm
S-II_2: 673.1 nm

While the human eye—due to its poor sensitivity to red light—can only detect the O-III and H-beta lines, a camera can capture all these colors.

High-performance nebula filters, such as the Omegon Veil nebula filters, suppress artificial lighting while allowing the colors of the nebulae to pass through. This makes it possible to observe faint emission nebulae—like the Cirrus Nebula or the North America Nebula—even outside of remote deserts or high mountain ranges. Technical Data
Performance
Housing material
Aluminum
Connection (telescope side)
2"
Central wavelength (nm)
500
Full width at half maximum (Angstroms)
7
General

Series
Veil
Type
Filter
Design
Line filter