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The numerical aperture of a microscope objective defines the objective's resolution. Each microscope objective has a minimum and maximum magnification necessary for the details in an image to be resolved. A simple formula for the minimum value is (500 x NA). And for the maximum magnification (1000 x NA).
Microscope World / Microscope Field of View Microscope Field of View The diameter of the field of an optical light microscope is the field number, which is the diameter of the field view in mm measured at the intermediate image plane. The field number is typically listed on the microscope eyepiece. The microscope field of view is found with the following formula: