Focal length is explained as the distance between the centre of the len to the sensor when the object is in focus. It is commonly measured in millimetre. In digital photography, focal length can range from 6mm to 800mm depending on the size of the sensor. Focal length is often associated with perspective, that is, your background will be magnified if you use longer focal length. To illustrate this perspective, refer to this link to help you to understand. You may also interested in how different focal length will help you to determine how far you can shoot. Go to the Canon website and scroll all the way till you find the focal length section.
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