The Zeiss™ 40X (0.5NA) LD A-Plan objective lens for the Thermo Scientific™ ArrayScan™ HCA Readers is made by the world renowned optics company, Zeiss. The Zeiss 40X (0.5NA) LD A-Plan lens represents the finest in optical with a magnification power suited for subcellular imaging, and a numerical aperture which strikes a balance between resolution and versatility.