Although it is not recommended, if the lenses fit the thread (RMS), then Olympus lenses can be used in conjunction with other brands. However, many manufacturers have changed the thread to prevent this. Moreover, the magnifications set by other manufacturers vary due to components such as tube length and chromatic aberrations are produced due to different corrections of other components. Immersion oil from other suppliers or unsuitable cover glasses can lead to chromatic shifts and as such using third-party microscopes may exacerbate this. The flatness/sharpness in the edge area is also unlikely to be satisfactory as only Olympus objectives are corrected for 26.5 field number.