Patent ID: 8780452
Filing Date: 2014-07-15
Classification: G02B

Abstract:
1. A zoom lens, comprising: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power, the first, second, third and fourth lens groups being disposed in order from an object side, the lens groups moving upon zooming from a wide angle end to a telephoto end of the zoom lens such that the distance between the first lens group and the second lens group increases while the distance between the second lens group and the third lens group decreases, the first lens group comprising a negative lens having a meniscus shape and a positive lens having a convex face on the opposite sides thereof, the negative lens and the positive lens being disposed in order from the object side, the second lens group comprising a negative lens, another negative lens having a concave face on the opposite sides thereof, and a positive lens, the negative lenses and the positive lens being disposed in order from the object side, the third lens group comprising a positive lens, a negative lens and another positive lens disposed in order from the object side, the fourth lens group comprising from a positive lens, wherein the zoom lens satisfies the following conditional expression (a): where F