These objectives are designed for use with a tube lens focal length of 200 mm and are ideal for machine vision applications or applications that require a significant distance between the objective lens and the object. The working distance of these objectives often exceeds. Pin On Microscopes Microscope objectives are generally designed with a short free working distance, which is defined as the distance from the front lens element of the objective to the closest surface of the coverslip when the specimen is. Long working distance microscope objective . With resolving power from 5 to 0.34 microns, these objectives work for a wide array of applications. All objectives have flat image surface over 42mm field of view, highest standard in the objective design. Long working distance objectives are often labeled with lwd. This microscope resolves 2 μm at a working distance of 20 cm. This stands for long working distance or ultra long working distance. In order to obtain sharp im...