The primary function of a lens in a camera is to focus light onto the image sensor, creating a sharp and clear image.

Focal length and angle of view have an inverse relationship. Longer focal length lenses have a narrower angle of view, while shorter focal length lenses have a wider angle of view.

Telephoto lenses with focal lengths of 85mm and above are commonly used for portrait photography due to their ability to compress the perspective and create a flattering look.

Wide-angle lenses with focal lengths less than 35mm are ideal for capturing wide landscapes as they allow you to fit more elements into the frame.

Focal length and depth of field have an inverse relationship. Longer focal length lenses produce a shallower depth of field, while shorter focal length lenses produce a deeper depth of field.

Telephoto lenses are used in sports photography to capture close-up shots of athletes while maintaining a distance from the action.

Super telephoto lenses with focal lengths of 300mm and above are preferred for wildlife photography as they allow photographers to capture close-up shots of animals from a safe distance.

Focal length and magnification have a direct relationship. Longer focal length lenses produce higher magnification, allowing you to capture close-up shots with more detail.

Standard zoom lenses typically have a focal length range of 18-55mm, providing versatility for a wide range of shooting scenarios.

Focal length and perspective have a direct relationship. Longer focal length lenses compress the perspective, making distant objects appear closer together, while shorter focal length lenses expand the perspective, making distant objects appear farther apart.

Wide-angle lenses with focal lengths less than 35mm are often used in street photography to capture a wide field of view and create a sense of immersion.

Focal length and the amount of light reaching the image sensor have an inverse relationship. Longer focal length lenses allow less light to reach the sensor, while shorter focal length lenses allow more light to reach the sensor.

Telephoto zoom lenses typically have a focal length range of 70-200mm, providing versatility for capturing distant subjects.

Focal length and the bokeh effect have a direct relationship. Longer focal length lenses produce a stronger bokeh effect, creating a more blurred and aesthetically pleasing background.

Macro lenses with focal lengths less than 50mm are specifically designed for close-up photography, allowing photographers to capture intricate details of small subjects.