user3680: can someone explain this numbers please?, what means equivalent?
Focal Length 4.25-42.5mm, 35mm equivalent 30.4-305mm
thanks for your help

user3592: From the wikipedia entry on focal length:

Due to the popularity of the 35 mm standard, camera–lens combinations
  are often described in terms of their 35 mm equivalent focal length,
  that is, the focal length of a lens that would have the same angle of
  view, or field of view, if used on a full-frame 35 mm camera. Use of a
  35 mm-equivalent focal length is particularly common with digital
  cameras, which often use sensors smaller than 35 mm film, and so
  require correspondingly shorter focal lengths to achieve a given angle
  of view, by a factor known as the crop factor.


3680: <p>can someone explain this numbers please?, what means equivalent?<br>
Focal Length 4.25-42.5mm, 35mm equivalent 30.4-305mm<br>
thanks for your help</p>
 3592: <p>From the wikipedia entry on <a href="http://en.wikipedia.org/wiki/Focal_length" rel="nofollow">focal length</a>:</p>

<blockquote>
  <p>Due to the popularity of the 35 mm standard, camera–lens combinations
  are often described in terms of their 35 mm equivalent focal length,
  that is, the focal length of a lens that would have the same angle of
  view, or field of view, if used on a full-frame 35 mm camera. Use of a
  35 mm-equivalent focal length is particularly common with digital
  cameras, which often use sensors smaller than 35 mm film, and so
  require correspondingly shorter focal lengths to achieve a given angle
  of view, by a factor known as the crop factor.</p>
</blockquote>
