Quote:
Originally Posted by mandragara
What do you guys think of the Baader O-III filter?
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The Baader O-III filter is an inexpensive photographic O-III filter.
It passes only one of the two O-III lines, so reduces the size and brightness of the O-III features from what our visual system needs.
I would recommend an O-III filter that passes both O-III lines at a high percentage, like Astronomik O-III or Lumicon O-III Gen.3 or TeleVue Bandmate II O-III or ICS O-III.
There could be a place for a single line O-III filter if you are investigating particular features in an O-III emission object, but be aware the field and object will be darker. It would be a second O-III filter, though, after you have purchased a dual line O-III filter for primary visual use.