AmScope AmScope 40X Plan Achromatic Microscope Objective Lens with Knurled Ring

This is a 40X DIN-standard objective lens for compound microscopes. It features achromatic color-correction, and plan field-correction. Features Specifications: Magnification: 40X NA: .65 Optical Working Distance: 0.633mm Thread: RMS Mechanical Tube Length: 160mm Cover Glass Thickness:0.17mm Color Correction: achromatic Field Correction: plan Immersion Medium: none Nosecone: spring