Astronomik O-III deepsky filter (2")

These filters transmit light only around the O-III wavelength. Recommended for supernova remnants and planetary nebulae but perform well on emission nebulae as well. In contrary to UHC filters these are not general-purpose deepsky filters. Perform well both visually and photographically.

The image below shows the transmission of different models. The best filter is the one where the transmission band is the narrowest, as this provest the highest contrast.

These filters transmit light only around the O-III wavelength. Recommended for supernova remnants and planetary nebulae but perform well on most of the emission nebulae as well. It gives the best contrast on these objects.