Model Number: AK028-L 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