Standard lens featuring superb quality and portability. Two high-refraction lens elements and Gaussian optics eliminate astigmatism and suppress astigmatic difference. Crisp images with little flare are obtained even at the maximum aperture.Superb lens featuring superb quality and portabilityf/1.4 speed makes it perfect for available-light shooting.Ideal lens to accompany a zoom when shooting in low-light conditionsCompact and affordableOnly lens in the EF System to combine the extra-small Micro USM and still provide full-time manual focusing when the lens