The key features of a camera lens include focal length, aperture, lens construction, and focusing capabilities.
Focal length: The focal length of a lens determines the magnification and angle of view. A shorter focal length will result in a wider angle of view, while a longer focal length will provide a narrower angle of view and more magnification.
Aperture: The aperture of a lens controls the amount of light that enters the camera. A wider aperture (lower f-stop number) allows more light to enter, resulting in a shallower depth of field and better performance in low light conditions.
Lens construction: The quality of the lens construction, including the number and arrangement of lens elements, coatings, and overall design, will affect the sharpness, distortion, and color accuracy of the images produced.
Focusing capabilities: The focusing system of a lens determines how quickly and accurately it can focus on a subject. Some lenses feature fast and quiet autofocus motors, while others may have manual focus capabilities for more precise control.
Overall, the key features of a camera lens work together to determine the overall performance and image quality of the lens. It is important to consider these features when choosing a lens for specific photography needs.