Feature: 1. Microscope lens, uses premium aluminum alloy, with high strength and wear resistance. 2. Using high‑quality industrial optical glass, multi‑layer coating processing technology, high accuracy, large aperture. 3. The image is clear and vivid, with high transmittance and clear picture quality, convenient for observing fine objects. 4. Easy to install and disassemble, and does not affect the installation and use of other accessories. 5. 8‑50mm adjustable focusing length, with manual focusing ring and aperture ring, can obtain clear images at different focusing distances. Specification: Condition: 100% Brand New Item Type: Microscope Lens Material: Aluminium Alloy Model: KP-850 Focusing Length: 8-50mm Image Size: 1/2.3in Relative Aperture: F1.4 Interface (Mount): C-Mount Field of View (F.O.V)(H/V)1/2.3in: W41.8°X30.8°/T6.42°X4.8° Back Distance of Flange: 17.53mm / 0.7in Aperture: Manual/Lock Zoom: Manual/Lock Image Size: 1/2 Size: Approx. 44x77.8mm / 1.7x3.1in Pixels: 3MP Back Focusing Length: 10.23mm / 0.4in Close-Up Distance: 0.5m / 1.6ft Working Temperature: -20℃-80℃. Package List: 1 x Microscope Lens Note: 1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.