Canon EF 24-70mm f/2.8 L II USM VS Canon EF 24-105mm f/4 L IS USM mounted on Canon EOS 1Ds Mark III : As a Canon user, potential purchasers of this lens will also likely consider the firm’s popular EF 24-105mm f/4L. Both are L-series and targeting professional photographers, however while the 24-70mm f/2.8 is one stop faster (theoretically Has full-time manual focus. Canon EF 200mm F/2L IS USM. Canon EF 300mm F2.8L IS II USM. With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode. COMPATIBLE LENSES. RED tested the following lenses and confirmed the functionality for use with KOMODO-X: RF LENSES. EF LENSES. Canon RF 15-35mm f/2.8 L IS USM 1. Canon EF 14mm f/2.8L II USM. Canon RF 24-70mm f/2.8 L IS USM 2. Canon EF 24mm f/1.4L II USM. Canon RF 24-105mm f/4 L IS USM 3. Canon Ultrawide Lenses Compared (Full-Frame) Canon 20-35 USM, 20-35mm f/2.8 L, 17-40mm f/4 L and 16-35/2.8II. enlarge. Canon 20-35 USM, 20-35 L, 17-35mm, 17-40mm and 16-35mm L II. enlarge. Canon 20/2.8 USM, 17-40/4 L, 16-35/2.8 L II and 16-35/4 L IS. bigger. Canon Ultrawide Lens Sharpness Comparison. Not shown here, but the 10-18mm has the same or even less distortion as does the 16-35mm. Ha! I expect that the Canon 16-35mm f/4 L IS should be the first really sharp Canon full-frame ultrawide, but today, a $100 used Rebel with the new $300 10-18mm turns out images about as sharp as the $1,700 16-35mm f/2.8 L II and $3,200 5D Mark III. I just yV5fANG.