1. Aperture: F/22 - F1.8 2. Lens structure: 6 elements in 5 groups 3. Aperture blades: 7 4. Applicable models: suitable for Canon SLR cameras 5. Viewing angle: 46 degrees (diagonal), 27 degrees (vertical), 40 degrees (horizontal) 6. Focal length: about 50mm 7. Filter diameter: about 58mm 8. Focusing distance: about 0.35m 9. Weight: about 162g 10. Size: about 7.5 x 5.1cm Features: 1. F1.8 large aperture, easy to achieve bokeh effect 2. 7-piece aperture blades to help take photos of circular faded dots or 14-star effect 3. Support automatic and manual focus to meet different actual needs 4. With built-in focus indicator 5. Mechanical structure and coating technology, effectively improve focusing accuracy, AF speed and light transmittance, and retain backlight ghost and flare 6. Using chrome-plated metal bayonet, it can be highly matched with the camera body, wear-resistant and corrosion-resistant, and durable 7. Firmware can be designed through the camera