Model Number: Aike-A K 0 2 8 Brand Name: Aike Global Key Specifications/Special Features: 1. Lens construction: 4Groups, 5Elements, includes an aspheric element2. Aspherical lens reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism3. Glass: 5Elements Germany Imported Glass, Brand Schott4. Aspherical macro lens continuously focus 10-50mm distance from objects, photograph high sharpness images without distortion, ideal for close-up shots, such as insect, flowers, small buddha, jewelry, PCB board, etc. Also ideal to examine skin and fur5. Wide angle lens FOV: 115°, magnification: 0.6X, Distortion: ≦0.2% 6. Coatings: Multi-layer anti-reflective coatings for double-side of each glass7. Lens housing: High grade aluminum alloy, CNC five-axis milling machine process, sand-blasting, fine finished.8. Lens hood: reduce ghosting, reflections, lens glare; Protect lens.9. CPL: Mounting for 37mm CPL filter (optional)10. Can unscrew off lens hood, switch to CPL