The wide lens or the short focal length lens will increase the perspective of the image and give the wider angle view such as lens 18 mm. can have 94 degree of angle. The wider angle lens can make the more distortion by the vertical line (90 degree) will slightly bend into the centre of the picture. However the high quality of wide lens can reduce the problem of distortion and also the more quality the more price. We should use the wide lens with the view picture because it give the more depth of field. Also we can take the macro by the wide lens but it will give the wider background.The new style of these type of lens will be designed in INVERTED TELEPHOTO that make the higher distance from lens to image sensor/film but it still can give the same focal length. Besides, it has the Shift lens or Perspective Control Lens that designed for architecture use so it can solve the problem of distortion (the vertical line (90 degree) will not slightly bend into the centre of the picture). Here is picture of shift lens: And here is compare between normal and shift lens:
Left: from Shift lens and right: from normal lens
