1. If the condenser is not in the center of the field of view of a microscope condenser oblique then reinstall, carefully adjust the Center screw

2. If the converter is not in the position of a microscope then go to where you locate

3. If specimens in a floating State then reliably reinforcement

Are several reasons for this, if you can take this into account for several reasons, then the problem can be solved! Microscope is a precision instrument, so the problem is unlikely to occur in General! If you have any questions you can contact us!