Varifocal camera objective with adjustment-range selection

摘要

A varifocal camera objective, having a rotatable control ring for adjustment to a desired focal length in a zoom range and to a closeup position in a macro range, is provided with a pair of independently settable stop members for selectively limiting the adjustability to less than the entire zoom range and for optionally excluding the macro range. The stop members coact with edges of a stepped recess in a rim of the control ring and are each indexable in an advanced and in a retracted position.