Canon EF 50mm f/1.4 USM Lens 

• Standard focal length 50 millimeter lens is effective in a multitude of shooting situations and ideal for day-to-day shooting
• Elements/Groups: 7/6, Diaphragm: Blades 8, Filter Thread: Font 58 millimeter. Minimum focusing distance: 17.8 inch
• An f/1.4 maximum aperture provides clear imaging in low light situations and shallow depth of field
• Ultrasonic autofocus motor (USM) operation is fast, smooth and virtually silent
• 2 high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference
• This large aperture standard prime lens has superior peripheral brightness even at the maximum aperture
• Lens construction: 8 elements in 6 groups, Filter size: 77 millimeter
• Optimized for Digital – super multi-layer coating minimizes flare and ghosting – a common problem of digital cameras
• The optimum optical design and molded glass aspherical lens elements provide excellent correction for all types of aberrations, including coma aberration, resulting in superior optical performance
• The Hypersonic Motor (HSM) ensures silent, high speed auto-focusing as well as full time manual focusing capability