However, in order to observe the specific behavior of microorganism, we should set the high-magnification ratio of microscope as shown in this video.
Therefore, as you can see, since the relative speed of microorganisms are increased, it is really difficult to track the position of cell continuously in this high-magnification ratio.
When we use the normal camera with the frame rate of 30 frame/sec, Paramecium moves out from the field of view of camera within 1 frame.
So, we cannot observe what's going on.
Therefore, we should realize the high-magnification and the observation of high spacial resolution at the same time for specific investigation.