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O-111 filter advantages in observing?

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I have come across references to an 0-111 filter (or is it 0-iii) And was wondering just what advantages this would give to an observer.

There are also a few remarks on the net regarding its usefulness being limited to scopes of a given size. I use refractors with a diameter of 102 and 120mm, therefore my question is weather or not I would gain any benefits from such a filter. (They don’t come cheap so I don’t want to splash out on something of limited use).


thanks for your time and any replies in advance.

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