Focal Length

Focal LengthAnother important camera basic is focal length. Focal length is the distance from the camera's lens to image sensor (or film). The more space between, the more zoomed in the image is. So how does this work? The light enters the lens, flips upside-down, and hits the image sensor. As you can see from the example, many of the longer focal lengths have a bigger area of light than the sensor can record. The area that does hit the sensor is what you see. It is a cropped image of the original. Thus, it is zoomed in. However, keep in mind, this uses the same amount of your image sensor (or film) as a smaller focal length. Thus, it is the same size (e.g. 8 megapixels) as any other picture taken with your camera. It is just 'zoomed in'.

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