Best place to learn about lenses

I am new to photography and I am trying to lean a lot about it and my camera (40D.) So my next step is to start understanding the lens. I always see you guys talking about lenses and you throw out all these numbers.

Well I have no idea what those numbers mean. So can some one give a link to a site that will teach me everything I need to know and a lens? Thanks in advance.

Here : http://www.the-digital-picture.com/Canon-Lenses/

About lenses:
http://web.canon.jp …g/enjoydslr/par​t3/3A.html
(keep pressing Next)

The best site, IMHO:
http://www.photozone.d​e/8Reviews/index.html

One more:
http://www.tamron.com …ng_center/defau​lt-new.asp

In my experience the best place to learn about lenses is actually here, on this forum.

More specifically, start by looking trough sticky threads in EF and EF-S lenses forum, they have most of the jargon explained there.

Hermeto wrote in post #4187835
The best site, IMHO:
http://www.photozone.d​e/8Reviews/index.html

It doesnt even list the 400, 500 or 600...

Also Photodo, Lensplay and FredMiranda reviews.

Buy Understanding Exposure. The thing you need to learn about first is the camera.

Thanks guys for the help.

...you're here!
HP