Features Type:Microscope achromatic Objective lens Magnification: 4X/10X/40X/100X Mounting size :20.2mm Standard RMS thread Material metal core Tube length : 160mm standard thickness of cover glass 0.17mm for Biological microscope Detailed information 4X :Numerical Aperture (NA) 0.1; working distance 18mm 10X: Numerical Aperture (NA) 0.25; working distance 7mm 40X : Numerical Aperture (NA) 0.65;working distance 0.53mm 100X :Numerical Aperture (NA) 1.25 ;working distance 0.13mm
eBay