Small-size wide angle lens and camera including the lens

A small-size wide angle lens substantially consisting of:

• a first lens group having positive refractive power;
• a stop;
• a second lens group having positive refractive power;
• and
• a third lens group having negative refractive power, which are arranged in this order from the object side of the small-size wide angle lens,
• wherein the first lens group includes a negative lens and a positive lens, and
• wherein the second lens group includes a negative lens and a positive lens, and
• wherein the third lens group includes a negative lens and a positive lens, and
• wherein at least one of the second lens group and the third lens group includes an aspheric surface, and
• wherein the following formulas (1) through (3) are satisfied:
• 1<f/Y<2 (1);
• 0.7<(SS+BF)/(DD+BF)<0.95 (2);
• and
• 3.4<Fno×(DD+BF)/Y<8 (3), where
• f is the focal length of the entire system of the small-size wide angle lens,
• Y is a maximum image height at an image plane,
• SS is a distance on an optical axis from the stop to a most-image-side surface in the small-size wide angle lens,
• BF is a back focus in air,
• DD is a distance on the optical axis from a most-object-side surface in the small-size wide angle lens to the most-image-side surface in the small-size wide angle lens, and
• Fno is a maximum aperture.