LBTEK Immersion Oil is designed for use with oil immersion objectives. Due to the high magnification of oil immersion objectives, the front lens is very small, resulting in limited light transmission. When light passes through media objects of different densities, some of the light refracts and scatters, leading to reduced illumination, a darker field of view, and unclear specimen observation. To address this issue, a medium with a refractive index similar to that of glass must be added between the lens and the slide to compensate for light loss. The refractive index of LBTEK immersion oil closely matches that of LBTEK cover slips, and using them together maximizes the light-gathering capability of the objective.