Designed for a wide variety of applications, our commercial objectives are provided in both achromatic and plan designs. Using DIN standard, 0.7965" (20.1mm) dia. threads, 36 TPI, 55° Whitworth, these objectives will fit into most microscope and spatial filter assemblies. Used in conjunction with our T- and C-mounting systems they are an ideal solution for OEM production use.Note: 40X and 100X versions are spring loaded. 100X version is also oil immersion type.