At 5.5 stop 14-35 is 0.5 stops better than 15-35, if no fast motion and DOF was not important this can make the 14-35 just 0.5 stop darker. 2. Better magnification. At 0.38x 14-35 is almost 2 times better than 15-35 at 0.21x making it capable of creating UWA macro shot that very few lens if any can do.

The EF 17-35mm f/2.8 USM L showed a very unusual vignetting characteristic. On an APS-C DSLR it can take advantage of a sweet spot behavior but at 17mm the lens already showed an optimal behavior with no measurable improvement when stopping down (yes, I repeated the test row to make sure). Due to the decreasing natural vignetting there's a

^{Canon EF 17 35mm f/2.8L USM 35mm Zoom user reviews : 4.2 out of 5 - 40 reviews - photographyreview.com}

Measuring 78.5x83mm and weighing 540g, it's rather larger and heavier than Canon's now obsolete EF 15mm f/2.8 fisheye prime lens, but still smaller and lighter than the regular EF 16-35mm f/2.8L

We review the Canon EF 20mm f/2.8 USM lens. focal length of this prime lens from Canon is on the edge of ultra wide angle when used on a full frame sensor or the 35mm film it was originally

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canon ef 16 35mm f 2.8 l usm review