Omegon Filters OIII Filter 1.25''
The Omegon OIII filter is comparable to the Omegon UHC filter in its function. The difference is that this filter only lets doubly ionized oxygen light through. This means that there is a huge increase in contrast to extremely faint, planetary, diffuse nebulae. This is a special narrowband filter that allows an even smaller wavelength range than Omegon's UHC filter. Still, there are countless astronomical objects that can first be seen in detail with this filter or not seen at all without it. A good example is the Veil Nebula in the constellation Cygnus.