Until the 11-24 L arrived, the widest rectilinear focal length available in a full frame DSLR lens was found in the Sigma 12-24mm Lens and the next widest option was found in the Canon's EF 14mm f/2.8L II USM Lens. Nikon's widest rectilinear lens (at review time) is also 14mm including prime and zoom options.
It does however employ Canon’s STM focusing which is smoother and quieter for live view and movie shooting, while also costing almost half the price of the EF 24-105mm f4L IS II USM. The EF 24-105mm STM employs 17 elements in 13 groups and a variable focal ratio of f3.5-5.6 with a seven blade aperture system, and offers a four-stop optical
The new EF 24-105 II version from 2016 had some Focus problems though: Canon warns of defective focusing in some EF 24-105mm F4L IS II lenses. These lenses have a 10 digit serial number with embedded date code. Only lenses with serial numbers beginning with 48, 49, 50 or 51 have the focus problems.
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canon ef 24 105mm f4l is ii usm lens review
