Features METAL MATERIAL: Reduction lens is made of aluminum alloy material, surface after oxidation treatment, pressure and erosion resistance, possess long service life MAGNIFICATION RATE: The best working distance is 120mm, the objective magnification is 0.7X, with the eyepiece focusing, adjustable 0.7X‑4.5x(about 10‑180 times on the display, about 0.49‑126 times on the display using 0.7X reduction lens) SCOPE OF APPLICATION: Reduction lens mounting thread diameter is 1‑3/4in(42mm), used for industrial microscope camera 42mm for C MOUNT lens, useful and practical FUNCTIONS AND USES: Auxiliary objective can be used to reduce the magnification, increase the working distance, expand the field of view, very versatile EASY INSTALLATION: Stereo microscope reduction lens adopt user friendly design for quick and hassle free setup, easy to operate, helps a lot 1. METAL MATERIAL: Reduction lens is made of aluminum alloy material, surface after oxidation treatment, pressure and erosion resistance, possess long service life 2. MAGNIFICATION RATE: The best working distance is 120mm, the objective magnification is 0.7X, with the eyepiece focusing, adjustable 0.7X‑4.5x(about 10‑180 times on the display, about 0.49‑126 times on the display using 0.7X reduction lens) 3. SCOPE OF APPLICATION: Reduction lens mounting thread diameter is 1‑3/4in(42mm), used for industrial microscope camera 42mm for C MOUNT lens, useful and practical 4. FUNCTIONS AND USES: Auxiliary objective can be used to reduce the magnification, increase the working distance, expand the field of view, very versatile 5. EASY INSTALLATION: Stereo microscope reduction lens adopt user friendly design for quick and hassle free setup, easy to operate, helps a lot Spec: Item Type: Reduction Lens Mounting Thread: 1-3/4in(42mm) Application: For industrial microscope camera with 42mm for C mount lens, reduce magnification, increase working distance How to Use: Take out the product and install to use. packing list: 1 x Reduction Lens Package List 1 x Reduction Lens