The Canon EF AF USM lens has been designed for capturing portrait photographs. The f/4.5 aperture of this Canon camera lens helps capture clear photos even in low light conditions. With a construction of 13 elements in 12 groups, this 105 mm f/4.5 lens effectively corrects the aberrations that occur while capturing photos. The 5-blade diaphragm in this Canon camera lens gives you great out-of-focus shots. Featuring an Ultra-Sonic Motor (USM), this 105 mm f/4.5 lens ensures quiet and high-speed autofocus. Moreover, the 58 mm filter thread of the Canon EF AF USM lens easily accommodates most of the protective lens filters.