The choice of objective lenses will depend on the application and on user preference. In general, when viewing or inspecting objects, it is advantageous to see more of the sample (i.e. have a larger FOV) and have a large depth of focus. Depending on the size of the subject, these requirements may indicate that the lower magnification (4x and 6x) lenses will be the most useful for inspection work and the higher magnification (≥8x) lenses more useful when more detailed work is required.