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The PhotoNotes.org Dictionary of Film and Digital Photography.

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Group.

Camera lenses are made of multiple individual glass lenses assembled together inside a cylindrical barrel. Sometimes these individual lens elements are assembled closely together to form a group.

Elements in a group are frequently cemented together with optically transparent glue to form a single physical unit. The advantage of cemented elements is that the elements have no glass-air surfaces within the group, which reduces reflections.

cf. barrel, Canada balsam, cemented element, compound lens, doublet, element, lens separation, transparent.

Entry last updated 2002-05-07. Term 577 of 1487.


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