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 Canon EF 24-105 mm f/3.5-5.6 IS STM is a relatively light lens. At 525 grams, it is 260 grams lighter than the 24-105 mm f/4L IS USM II. That is not due to the number of lens elements. That is the same for both. The construction is different. 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. nrEM.
