Choosing the right lens for your DSLR camera is just as important as choosing the right camera body. Here are some key factors to consider when selecting a lens:

1. Focal length: The focal length of a lens determines its angle of view, or how much of the scene it can capture. A shorter focal length lens (such as a 35mm or 50mm) is often used for wide-angle shots or general-purpose photography, while a longer focal length lens (such as a 70-200mm) is typically used for zooming in on subjects from a distance, such as sports or wildlife photography. Consider what type of photography you will be doing and choose a lens with an appropriate focal length.
2. Aperture: The aperture of a lens determines how much light it lets in and how shallow the depth of field can be. A wider aperture (indicated by a lower f-stop number) is useful for low-light photography and creating a shallow depth of field effect, while a narrower aperture (indicated by a higher f-stop number) is useful for landscape and architecture photography, where a wide depth of field is needed. Consider what type of lighting you will be working with and choose a lens with an appropriate aperture.
3. Image stabilization: Image stabilization can be a useful feature in lenses, as it helps to reduce camera shake and produce sharper images. Consider whether image stabilization is important to you and choose a lens with this feature if it is.
4. Brand compatibility: Consider the brand of camera you have and choose a lens that is compatible with your camera’s mount. Different camera brands use different mounts, so it’s important to choose a lens that is specifically designed for your camera.
5. Price: Lenses can vary greatly in price, from a few hundred dollars to several thousand. Set a budget that you are comfortable with and look for a lens that offers the features you need within your budget.
6. Reviews: Read reviews and do your research before purchasing a lens to ensure that it meets your needs and performs well in real-world conditions.

Ultimately, the best lens for your DSLR camera will depend on your individual needs and preferences. Consider the type of photography you will be doing, your budget, and the compatibility with your camera before making a decision.