Buying my first L lens...which one is best for video?

[rocketdesigner]

The Canon 70-200 f2.8 (NON-IS) is a parfocal lens; it maintains focus while zooming and thus provides an excellent benefit for shooting video with live zooms.

Plus, it is a great price.

 

[bvukich]

I had EF 28-135 IS which was not L but could be something to consider - acceptable picture quality, IS, very good mm range and affordable price. I am sure you would achieve better results with it in video than 70-200 f4 no IS.

The 28-135 IS has a loud IS system, so make sure you get an external mic if you are planning to go that route.

 

[Halfrack]

Here's a good read for you:

http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/5