| 摘要 |
<p>The present invention relates to a zoom lens, a camera and a portable information terminal device. Provided is a small-sized zoom lens consisting of about 10 lenses, wherein the lens has a half angle more than 38 degrees during wide angle, has a magnification more than 8 times, and has a resolution capable of dealing with a shooting component having 10 mega-pixel to 15 mega-pixel. The zoom lens is characterized in that: first to fourth group of lenses (G1- G4) respectively having a positive refractive power, a negative refractive power, a positive refractive power and a negative refractive power are arranged from an object side, a diaphragm (S) is arranged between the G2 and the G3, when zoom is performed from the wide angle to telescope, the lenses move to increase a space between the G1 and the G2, reduce a space between the G2 and the G3, and increase a space between the G3 and the G4, wherein the G1 and the G3 are closer to the object side during telescope than during the wide angle, a material of at least two positive lenses contained by the G1 satisfies the conditions as follows: 1.52 < nd < 1.65, 65.0 < vd < 75.0, 0.005 < Pg, F - (-0.001802vd + 0.6483) < 0.050.</p> |
