The 24-105mm F4 II is a solid lens to begin with. It has a useful zoom range, and its optics are much better than the first edition of the lens. Canon EF 24-105mm F4L IS USM. 3.5. MSRP $1,099.
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. Announced Feb 6, 2015. Discuss in the Canon SLR Lens Talk forum. Manufacturer description: The Canon EF 11-24mm f/4L USM ultra wide-angle zoom lens is designed to deliver high quality, minimally distorted images throughout the entire zoom range. Featuring the widest angle of view (126º05’ diagonal) ever achieved for a rectilinear full-frame The new lens, the EF 24-105mm f/4L IS II USM ($1,099), also sports a more modern fit and finish, with larger zoom and focus rings, and a lock to keep it at its shortest position when

The Canon RF 24-105mm F4-7.1 IS STM is the most affordable zoom lens for the R system, and one of the smallest and lightest full-frame zooms you can get for any camera. MSRP $399.00 $399.00 at Amazon

The Tamron lens has a longer range of focus ring rotation, 146° vs. 97°. The Sigma lens is not weather sealed. While both lenses have the same list price, the 7-year-older Sigma is seeing decision-factor-strength instant rebates at review time. With a primarily Canon kit, I next wanted to see the awesome Canon EF 35mm f/1.4L II USM Lens compared.
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canon ef 24 105mm f4l is ii usm lens review