The cost of a lens depends on several things. Less expensive lenses will generally have variable apertures so as you zoom, the maximum aperture gets smaller. More expensive lenses have a fixed aperture.
The good news is that all major camera and lens manufacturers offer a variety of focal lengths to satisfy most budgets. After you’ve answered those two questions, it’s time to take a look at the different types of lenses and how they can be used. As you read these next few sections, make sure to focus on what you plan to shoot.