The autofocus function works without any problems. In addition, to achieve both aberration correction and high image quality, Canon's proprietary technologies are generously employed, including ground aspherical lenses, Super UD lenses and UD lenses that effectively correct chromatic aberration, and special coatings such as SWC (Subwavelength Structure Coating) and ASC (Air Sphere Coating) that provide high anti-reflective properties.
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