Long-focus.
Lens of relatively long focal length designed to provide a narrower angle of view than the normal or standard lens, which generally has an angle of view, expressed on the diagonal of the film format, ...
Long-focus Edit
A long-focus lens is any lens with a focal length longer than normal. A long-focus lens brings far subjects closer, like a telescope. They therefore have a smaller angle of view than a normal or wide-angle lens.
Very long-focus lenses may require the camera to be fitted with special extra-long rails and bellows.
Telephoto Lens A specific type of long-focus lens in which a positive (converging) lens element is placed in front of the diaphragm and a negative (diverging) lens element is placed at the rear of the diaphragm.
by shading or unintentionally by inappropriate equipment, such as unsuitable lens hood or badly designed lens. A common fault of wide-angle lenses, owing to reflection cut-off, etc. of some of the very oblique rays. May be caused in some long-focus ...
And they use long-focus (long focal length) lenses to bring distant objects closer. This is fine, but it is only part of the story. Lenses of different focal length are also used to control perspective.
 See also: View, Image, Focus, Focal, Film
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