Advance to a new realm of image quality with the Advanced 2 Lens Kit. Including the ultra-wide EF 17-40mm f/4L USM zoom lens and the compact EF 50mm f/1.4 USM standard prime lens, it provides two excellent options in a single bundle for stunning detail and fast focusing. Whether taking a shot of a changing sunset or the beauty of a smile, you can be sure you'll capture the moment with both lenses available to change on the go. An L-Series lens professionally regarded for high optical performance, the EF 17-40mm f/4L USM brings out detail in wide shots from dramatic landscapes to group pictures, and is weather-resistant for reliable use even in harsh conditions. The EF 50mm f/1.4 USM is compact, lightweight and highly portable with a bright maximum aperture of f/1.4 for excellent low-light performance and beautiful background blur ideal for portraits. Both lenses use an ultrasonic motor that delivers fast and near-silent autofocusing with full-time manual focus, helping to ensure you can take the shot when you want, how you want.