How a Lens Works?
All lenses filter and focus light so that it hits the sensor or film strip correctly. However, there are a variety of other factors that determine how a camera lens affects the look and quality of the final photo. Such as Focal Length, Glass Quality and Inner Focusing Mechanics.
Quality
Consequently, a high-quality lens can help you capture great photos even with a cheap camera, while a low-quality lens can make the best camera mediocre and the resulting image quality, poor.
Lens Types
There are only two main types of lenses, Prime and Telephoto. Prime lenses have a fixed focal point like 50mm or 85mm. They are often used in portrait photography and are excellent at capturing Bokeh. The other type of lens is the Telephoto lens and is commonly used in wildlife and action photography. Giving users the flexibility to capture subjects at variable focal lengths.
Focal Lengths
Focal length is used to determine the distance a lens can reach. Digits are commonly termed in millimeters. With lengths varying between 16mm and 400mm. 16mm has a wide angle of view where as 400mm would have a sharp angle of view as it is zoomed in.
Aperture
Aperture determines the amount of light that will reach the sensor by opening and closing the hole where light passes thru to the sensor. Aperture settings commonly run from f1.2 – f22. Lenses that have a fixed aperture tend to be more expensive and are made of high quality glass. Not every lens is made to auto-focus, however most lenses are capable of this feature.
