LENS SYSTEM FOR A MACRO LENS FOR INDUSTRIAL USE IN QUALITY ASSURANCE OF A PRODUCTION PROCESS

摘要

The invention relates to a macro lens for industrial use in the quality assurance of a production process, the lens comprising a lens group on the object side, a lens group on the image side and an aperture stop provided therebetween. The lens group on the object side has, running from the object side to the image side, a first lens sub-group with a positive optical power, a second lens sub-group with a negative optical power and a third lens sub-group with a positive optical power, and the lens group on the image side has, running from the object side to the image side, a first lens sub-group with a positive optical power, a second lens sub-group with a negative optical power and a third lens sub-group with a positive optical power.