- 1. With the lower focal points all in the same plane; -- said of sets of eyepieces so mounted that they may be interchanged without varying the focus of the instrument (as a microscope or telescope) with which they are used. Source: webster
- 2. With the lower focal points all in the same plane; -- said ofsets of eyepieces so mounted that they may be interchanged withoutvarying the focus of the instrument (as a microscope or telescope)with which they are used. Source: adambom
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parfocal
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theyeyepiecesfocalfocusinstrumentinterchangedlowermicroscopemountedplanepointssaidtelescopesetsvarying