Astronomik O-III Narrowband Filter for 2''

The Astronomik O-III filter is made for visual observing of gas nebulas and planetary nebulas. The transmission is very narrow, more than the UHC filter. By that it results in a much higher contrast. Especially  at Super Novae like the Cirrus Nebula or Planetary Nebulas the more in contrast may be crucial for seeing or not.

Which objects could be observed:

This filter enables you to observe Super Novae or Planetary Nebulas with a much higher contrast.

For which telescope this filter can be used:

We recommend the O-III filter for telescopes from 150 mm aperture onwards. With smaller telescopes you won´t have enough light. Here it´s better to use the UHC or UHC-E. From 25 cm aperture onwards most star observer prefers the O-III over the UHC.


Delivery contains:

• Filter
• Filterbox