You may think that brand is the first thing to decide. If you are still searching for a camera, this would be true. Looking at lenses when deciding which camera brand to buy is very wise. Each camera body is best when paired with lenses made by the same manufacturer, specifically designed for that particular camera. It is true that you can get a third-party lens by companies such as Sigma, Tamron, and Tokina.
Many people do get such lenses and are perfectly happy.
The may cost more but they are worth every extra penny. While the brand you choose is determined for the most part by which camera you own, other decisions still need to be made. The first decision to make is whether to go with a zoom or a fixed focal length lens. It is basically a lens that does not zoom. In the infant days of zoom lenses, these contraptions just didn't cut the mustard.