Patent ID: 6697202
Filing Date: 2004-02-24
Classification: G02B

Abstract:
A retrofocus imaging lens comprising in order from an object side:a first lens group having a positive refractive power as a whole constructed by a front-side first lens group having a negative refractive power as a whole and a rear-side first lens group having a positive refractive power as a whole; and a second lens group having a positive refractive power as a whole, wherein each of the front-side first lens group and the rear-side first lens group includes one positive lens and two negative lenses, the second lens group includes one or more positive lens and one or more negative lens, and a conditional expression (1) is satisfied âˆ’1.251a/f1bwhere f1a denotes a focal length of the front-side first lens group, and f1b represents a focal length of the rear-side first lens group.