The Canon RF 24-70mm f/2.8L IS USM lens is a lightweight, high-quality mirrorless piece of glass that is a great option for anyone looking to take low light landscapes and astrophotos. Canon EF 24-105mm f/4L IS USM Tweet Share . Lens Reviews / Canon Lenses i Lab tested. Lens Review Specifications Lens Specifications; Name: Canon EF 24-105mm f/4L IS USM: Image Circle: 35mm: The 17-55 EF-S f2.8 is the best lens for the people who lean back, and the 24-70 f2.8 EF lens is for the people who lean forward. The overall best all-around. portrait lens for a crop Canon camera is not made by Canon. It is the new Tamron 24-70mm f2.8 stabilized lens.bos for all sorts of final results. That takes care of allaround use. This Sony is also smaller, lighter and easier to use than the Canon 24-105/4 L II, and once-great Nikon doesn't even make a 24-105mm lens. Bravissimo, Sony! Good Ultrasharp at every setting, especially wide-open at f/4. Excellent bokeh. Constant f/4 at all focal lengths. Very fast and silent autofocus. Focus lock button. The Canon 11-24 is a rather unique lens without a direct competitor at this time that offers the same ultra-wide focal lengths, at least at 11mm. Canon EF 11-24mm f/4L USM User Reviews. UYXm.