Hi guys, it' time for me to write another review of mine. This time I'll deal with one of the most famous Canon L-series lens: the 17-40 F/4 L.

Well, L-series lenses are Canon's models of excellence, top quality lenses provided with top quality construction body. When Canon makes a lens of this quality, it carries that catchy red ring on the extremity near the lens that emanates power and self confidence, really =)

What's so special in this lens anyway? Well...

First thing first, the body. It is made in sturdy magnesium alloy, it's waterproof, and the focus and focal rings run so smooth it's a pleasure tu use them. This is also the lightest L lens available, with a weight of only 475 g. Despite of that, it's a rock-solid jewel.

Quality lens: well, here we come to levels of absolute excellence....

Canon 70-200 F/4 L is said to be one, if not THE, of the best lenses Canon ever produced. I've bought it a few days ago, and I can estabilish they talked well. This lens is AWESOME.

The IS one is even better because of the stabilizer, but the optic scheme is the same.

Let's view it in the detail.

First, the body of this lens is white. Or should I say beije. Anyway, it's not the usual black. Every Canon L telephoto lens is white, and there's a reason: L lens all have a metal body, and if you use in a hot sunny day the lens itself could get scorching. Not only that, but chronic dilations and costrictions could cause problems with your lens. That's why Canon decided to make them white: bright colours have an albedo (reflective power) far greater than dark ones, and that limits overheating and ...