The Canon EF 24mm f/1.4L USM Lens is soft wide open, increasing in sharpness until very sharp at f/2.8. Corners are somewhat soft until stopped down some - becoming very sharp for a 24mm lens. Light fall-off is very noticeable at f/1.4, and, as usual, improves as the lens was stopped down. The 24 L exhibits noticeable amounts of CA. Although it is soft wide open, the Canon EF 50mm f/1.4 USM Lens is sharp at f/2 and very sharp when stopped down to f/2.8 or narrower. Corners are soft until f/2 for 1.6x FOVCF bodies and f/2.8 on full frame bodies. Strong halation is present at f/1.4 (a soft, dreamy look) with some CA (Chromatic Aberration). At launch 1997 Canon wrote this regarding Canon EF 24mm F1.4 L USM : "The fastest wide angle L lens in its class with excellent definition. The first EF lens uses a ground and polished aspherical glass lens element and a UD (Ultra-low Dispersion) glass lens element simultaneously, in order to achieve a large f/1.4 aperture and superb optical 10 out of 10 points and recommended by perpera (13 reviews) Sharp wide open. Great Bokeh. Fast AF. L Quality. None. THE fastest lens at 24 mm. reviewed November 23rd, 2006 (purchased for $1,000) has a silent focus motor built into the lens. Canon EF 24-70mm F/2.8L II USM. Canon EF 24mm F/1.4L II USM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance. Canon EOS 5D Mark III Canon EF 85mm F1.2L II USM Canon EF 16-35mm F2.8L II USM Canon EF 100-400mm f/4.5-5.6L IS USM Canon EF 100mm F2.8L Macro IS USM +2 more Reply Reply with quote Reply to thread Complain EF-Mount Lens/Full-Frame Format. Aperture Range: f/1.4 to f/22. Two Aspherical and Two UD Elements. Sub Wavelength Coating. Show More. Blending a favored wide-angle focal length with a bright maximum aperture, the EF 24mm f/1.4L II USM is a Canon L-series lens characterized by a robust physical construction and sophisticated optical design. The EF 50mm f/1.4 USM is Canon’s mid-priced 50mm fast prime, sitting between the inexpensive F1.8 and high-end F1.2 lenses. It offers excellent optical quality, especially when stopped down a bit, and offers a generally more-refined experience than the cheaper lens. It performs very well as both a ‘normal’ lens on full frame cameras, and We used Canon's 200mm ƒ/2.8L II USM telephoto lens to test the 1.4x III Extender, comparing the sharpness of the lens with and without the extender attached. Without the extender, the lens shows Mount: Canon EF Lens construction: 12 elements in 16 groups Angle of view: 24-6 degrees Diaphragm blades: 9 Minimum aperture: f/32-38 Minimum focusing distance: 0.98m Maximum magnification ratio: 0.31x Filter size: 77mm Dimensions: 94x193mm Weight: 1,640g. Canon EF 100-400mm f/4.5-5.6L IS II USM (Black) at Amazon for $1,379.99; Key features MtSYmh.