= Labeling of Objectives by Leica Microsystems
https://www.leica-microsystems.com/products/microscope-accessories/microscope-objective-lens/labeling-of-objectives/
Primary manufacturer reference. Sections “Working Distance”, “Correction Collar” and “Diameter of Objectives” distinguish free working clearance, optical-medium/coverslip correction and objective mechanical geometry. Corporate publisher: Leica Microsystems.
https://www.leica-microsystems.com/products/microscope-accessories/microscope-objective-lens/labeling-of-objectives/ . Sections “Numerical Aperture” and “Iris Diaphragm” describe the aperture/resolution/depth-of-field tradeoff; “Diameter of Objectives”, Figure8, compares different objective bodies with the same45mm parfocal distance.
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