Lenses

The every time I use my camera, I start thinking that I may have bought some things that aren't best suited for my needs. I bought some lenses before getting my camera, and am beginning to realize that they were premature purchases. For the type of filming I'm doing, I don't really see a need for the Canon 70-300mm lens. I've been thinking about doing some trading and swapping so to speak.

I saw a Sigma 18-50mm f/2.8-4.5 which looks pretty nice. I'm thinking about trading my Canon EF-S 18-55mm f/3.5-5.6 for that. Although the Sigmas come with mix reviews, this particular lens is much faster, has nearly the same focal length, has a shorter minimum focal range (meaning objects at a foot from the lens are still in focus) and the length of the lens doesn't change during focusing or zooming. This is important, as it means I can use this lens with my follow focus, something I can't do with the Canon kit lens.