PRODUCT DESCRIPTION 
Released back in 1997 the Canon EF 24mm f/1.4 USM L is one of many ultra fast fix focals in the Canon lens line-up - seems as if Canon is really enjoying to go to the max in this niche. Regarding its release date it is obviously a full frame lens. On APS-C DSLRs it has a field-of-view equivalent to a classic ~38mm lens so it can be considered as a moderate wide-angle lens here.
The optical construction is made of 11 elements in 9 groups with one ground aspherical element and one UD (Ultra-low Dispersion) element. Its minimum focus distance is 0.25m resulting in a max. object magnification of ~1:6. Typical for many high performance wide angles the lens features a floating system to achieve a constantly high image quality throughout the focusing range. The aperture mechanism has 7 aperture blades. The filter size is 77mm. In order to achieve a max. aperture of f/1.4 Canon had to use big glass elements so the lens is rather fat at 84x77mm and comparatively heavy (550g). A petal-type hood is included.
 
As to be expected from a member of the professional grade Canon L league the lens is beautifully crafted with a metal body and high quality plastics. The very broad, rubberized focus ring has a smooth and well damped action. The front element does not rotate so using a polarizer is no problem. The focusing speed is very fast and thanks to USM the AF noise level is near silent. Typical for ring-type USM AF drives full-time manual focusing is possible in one-shot AF mode.
 
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 corner-to-corner delineation is attained from 10 in. (25 cm) to infinity.
 
Useful Links:
https://www.the-digital-picture.com/Reviews/Canon-EF-24mm-f-1.4-L-USM-Lens-Review.aspx
https://www.imaging-resource.com/lenses/canon/ef-24mm-f1.4l-usm/review/
https://www.opticallimits.com/canon-eos/152-canon-ef-24mm-f14-usm-l-test-report--review
https://www.fredmiranda.com/reviews/showproduct.php?product=20
 
Product ($999) SN: *3277/ *3620/ *4237 
Condition: Excellent (EX) 
Warranty: 2 weeks shop warranty, covering manufactural defects 
Includes: F/R caps 
 
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