Generally, it is important to start with the scanning objective in place rather than the high-power objective because the scanning objective is used for viewing larger specimen and searching for them while the high power objective is used for fine and final focusing.
What is a scanning objective?
It refers to the objective that we use to look at larger specimens under the microscope, or to locate regions of interest prior to switching to a higher objective.
What is a high power objective?
It is related to the high power microscopes because of their two-stage magnification: This microscope are seen in laboratories and on television.
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