Offering the quiet and smooth autofocusing benefits of a stepping motor for full-frame EOS DSLRs, Canon's EF 24-105mm f/3.5-5.6 IS STM Lens is a standard telephoto supporting the use of the Movie Servo AF mode. Complementing the focusing precision is an equally apt Optical Image Stabilizer, which helps to minimize the appearance of camera shake by four shutter speed stops to benefit working with slower shutter speeds or longer focal length positions. This wide-angle to telephoto zoom lens is designed as a useful option for everyday shooting, and champions working in difficult lighting conditions for both photo and video applications.With regard to the optical design, this lens incorporates two aspherical elements and one UD element to reduce chromatic aberrations throughout the zoom range and benefit overall image sharpness and clarity. Furthermore, optimized coatings have also been applied to individual elements to suppress surface reflections for contrast-rich, color-neutral imaging.The lens is also designed around a seven-group zoom optical system, along with an inner-focusing mechanism to quicken focusing times. Additionally, a seven-blade rounded diaphragm is employed to produce a smooth out-of-focus quality beneficial to selective focus imagery.