Its 11 elements in 9 groups and the aspherical Canon lens elements give you a powerful filtering capability built right into the lens assembly and coated on the lens itself. These help remove the light pollution elements like flares and aberrations or distortions. If taking out of focus shots is your thing this lens does some phenomenal effects with the back and foregrounds but can also keep them in perfect synced focus. 3-stop compensation also helps you take better hand held and moving target images.
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