Originally posted by RioRico But ask yourself: Where am I going? What lens(es) will get me there? What can I afford that will make me happy? Answer those, and you'll have a better idea of what to acquire.
While I frequently agree with this statement whenever you make it (and you make it frequently
), I think it's very different for someone who's buying a DSLR for the first time and doesn't understand what "18-55mm" represents. Those are just obscure numbers that don't do a very good job of representing how the picture will look to a user. Sure, you can look at field of view and feet of coverage at a specific distance, but even that is abstract unless you've been using an 18-55mm lens for a while.
One way that I've found helps people is to mention that at 30mm, there's no magnification involved (on a Pentax digital). What you see with the naked eye is pretty much what you get in the resulting picture. By that logic, 18mm means your lens will see almost twice as wide as at 30mm, and 300mm means you'll get 10x magnification over 30mm. That would make a 18-55mm and 55-300mm combination equivalent to an 11x zoom point and shoot camera.
edit: but with much better image quality, obviously