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Features : OOTDTY Type:Microscope achromatic Objective lens Magnification: 4X/10X/40X/100X Mounting size :20 Standard RMS thread Tube size : 160mm standard thickness of cover glass 0 for Biological microscope Detailed news : 4X :Numerical Aperture (NA) 0; operating distance 18mm 10X: Numerical Aperture (NA) 0; operating distance 7mm 40X : Numerical Aperture (NA) 0;working distance zero 100X :Numerical Aperture (NA) 1 ;working distance 0