Baader OIII visual filter 10nm designed for observation of gaseous and planetary nebulae.
The extremely narrow pass band of the two OIII lines brings a substantial contrast gain to these lines even under best observation conditions. On faint super nova remnants and faint planetary nebulae the Baader OIII filter will often make the difference as to whether the object can bee seen or not!
The Baader OIII filters can enhance the view of dispersed objects, generally speaking, to the whole visual field of view of the eyepiece and are not limited to only the center of the eyepiece.
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