Zoom lens, camera, and mobile information terminal

A camera comprising a zoom lens as a shooting optical system, wherein the zoom lens includes

• a first group optical system having a positive refracting power;
• a second group optical system having a negative refracting power;
• a third group optical system having a positive refracting power;
• and
• a diaphragm that moves toward an object side integrally with the third group optical system, wherein
• the first group optical system, the second group optical system, and the third group optical system are sequentially arranged from the object side toward an image side,
• at least the first group optical system and the third group optical system moves in such a manner that a distance between the first group optical system and the second group optical system becomes minimum at a short focal-length side, and a distance between the second group optical system and the third group optical system becomes minimum at a long focal-length side, and
• the third group optical system includes a triplet lens formed by sequentially bonding a negative lens, a positive lens, and a negative lens.

A mobile information terminal comprising a zoom lens as a shooting optical system for a camera unit, wherein the zoom lens includes

• a first group optical system having a positive refracting power;
• a second group optical system having a negative refracting power;
• a third group optical system having a positive refracting power;
• and
• a diaphragm that moves toward an object side integrally with the third group optical system, wherein
• the first group optical system, the second group optical system, and the third group optical system are sequentially arranged from the object side toward an image side,
• at least the first group optical system and the third group optical system moves in such a manner that a distance between the first group optical system and the second group optical system becomes minimum at a short focal-length side, and a distance between the second group optical system and the third group optical system becomes minimum at a long focal-length side, and
• the third group optical system includes a triplet lens formed by sequentially bonding a negative lens, a positive lens, and a negative lens.