Tengo mi cámara réflex, y ahora, que lentes debería comprar?

Which Lens Should I Buy?

So you have a digital SLR now - great! Now you are thinking about adding a new lens to your collection and are wondering how to go about choosing a lens. Luckily we have the following video to present to you.
The video covers the various factors involved in choosing a lens for your DSLR.

Fuente: http://betterdigitalphotography.blogspot.com/2011/03/which-lens-should-i-buy.html