When using a microscope, the first thing to consider is what you need to observe and what kind of observation/imaging results you want to achieve, before deciding which type of microscope to use. If the ideal clear-field microscope effect is to be achieved (referring to the microscope's optimal resolution), but the microscope uses achromatic or phase-difference objectives, or the aperture of the condenser is only 1.2 (Abbe condenser), then no matter how hard you try, it is impossible to take the best photo (when working with an oil filter).
Therefore, before shooting, it is crucial to check whether the type and components of the microscope used are compatible, and whether the adjustment method is correct. Generally, to determine whether the microscope method is correct, first check the type of objective, then check whether the condenser is used correctly, and finally verify whether it meets Kohler illumination requirements.
