Function: 1. Low power: The achromatic lens has a larger aperture at low magnification, a brighter image, and a larger field of view. The high magnification lens has a reduced field of view and brightness. 2. Parallel optical method: The achromatic lens of the microscope is a parallel optical method without pinching angles, correcting spherical aberrations and convergence. 3. Clear field of view: The low magnification achromatic lens has a clearer and sharper edge of the field of view. The field of view is slightly wider than that of a regular achromatic lens. 4. Precision-crafted, universal thread: The microscope lens is precision-crafted with a chrome-plated surface the metal provides comfort. Universal Standard Thread RMS 20,2 mm or 0,79 in. 5. Premium Material: The achromatic microscope lens set is made of high-quality copper and optical glass, which is durable, resistant to corrosion, and has a high light transmittance. Specification: Item Type: Achromatic Lens Material: copper, optical glass Magnification: 1X Numerical aperture: 0,05 mm or 0,002 inch Applies to models: biological microscope List of packages: 1 x Achromatic lens 1 x do storage case (installed) 1 x Protective Cover (Installed)