This lens is an EF 24 mm 1.4 L USM.
Lens construction: 11 elements in 9 groups
Diagonal angle of view: 84°
Focus adjustment: Rear focusing system with USM
Closest focusing distance: 0.25m / 0.8ft
Filter size: 77mm
Thanks to the floating construction, excellent corner-to-corner
delineation is obtained from 25 cm to infinity
Professional wide-angle lens with an ultra-large maximum aperture of f/1.4.
This is the first EF lens to employ both a replicated aspherical lens element to suppress distortion and spherical aberration, and a UD lens element to correct lateral chromatic aberration. Thanks to the floating construction, excellent comer-to-corner delineation is attained from 25 cm to infinity.
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You have 252 days until The Societies of Photographers Convention starting on Wednesday 11th January 2017