Home / Custom / Optical Lens / Microscope Objective / Plan Apochromatic Objective ECOPTIK custom microscope objectives are suitable for any application requiring extreme image resolution, color fidelity, and field of view flatness. Example: 100x objective lens/flat field apochromatic objective lens: NA:0.9, WD:0.3mm; 20x microscope objective/flat field apochromatic objective NA: 0.4, WD:1.7mm.