This is a 60X DIN-standard objective lens for compound microscopes. It features achromatic color-correction, and plan field-correction. Features Specifications: Magnification: 60X NA: .85 Optical Working Distance: 0.49mm Thread: RMS Mechanical Tube Length: 160mm Cover Glass Thickness:0.17mm Color Correction: achromatic Field Correction: plan Immersion Medium: none Nosecone: spring