Before revision: For an objective with magnification , the FOV is related to the Field Number (FN) by , if other magnifying lenses are used in the system (in addition to the objective), the total for the projection is used.
After revision: For an objective with magnification the FOV is related to the Field Number (FN) by , if other magnifying lenses are used in the system (in addition to the objective), the total for the projection is used.