JPH05249372

PURPOSE:To simplify a focusing mechanism so that a cost can be lowered by adopting a method in which part of a lens system is interchanged in order to perform the focusing of a photographing lens. CONSTITUTION:A plastic lens L1 in a meniscus state whose concave surface is faced to a subject side is provided on a place nearest to the subject side, and the plastic lens L1 is switched to the plastic lenses 2-4 in the meniscus state which are integrally molded with the lens L1, whose concave surfaces are faced to the subject side and having different curvature based on an object distance so that the focusing can be performed.