What is a Telephoto Lens ?

What is a Telephoto Lens ?

A telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length. This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens in a much shorter overall design.

 

The two most common uses of a telephoto lens by a professional photographer would be:

  • Put backgrounds out of focus
  • Change the perspective of the picture

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