Widefield Microscope Eyepieces, 10X Microscope Eyepieces, Wide Angle Eyepieces, High Eye Point Eyepieces, Microscope Accessories, microscope eyepiece with mesh, Microscope spare parts, women's eyepieces, with rubber eyecups, Hot sale, new arrival, best selling, 4X 10X 20X 40X 60X 100X Achromatic Objective Lens 195 mm Conjugate Distance Tube Length 160 mm Biological Microscope Objective Specification: Type: Microscope achromatic Objective lens Magnification: 4X/10X/20X(S)/40X(S)/60X(S)/100X(S+Oil) Mounting size: 20.2 mm Standard RMS thread Material: Precision Copper core Tube length: 160 mm standard thickness of cover glass 0.1 7mm Conjugate Distance: 195 mm Mounting Thread: 20.3 x 0.705 mm Standard DIN 160/0.17 HD achromatic objectives for Biological microscope 4X: Numerical Aperture (NA) 0.1; working distance 18 mm 10X: Numerical Aperture (NA) 0.25; working distance 7 mm 20X (S): Numerical Aperture (NA) 0.4; working distance 0.55 mm 40X(S): Numerical Aperture (NA) 0.65; working distance 0.53 mm 60X (S): Numerical Aperture (NA) 0.65; working distance 0.13 mm 100X (S+Oil): Numerical Aperture (NA) 1.25; working distance 0.1 3mm