Imaging lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorsTaro ASAMI, Takeshi KAMIYA
Life of this patent
Estimating the term…
Abstract
Disclosed are an imaging lens having satisfactory performance in a region of near infrared light, and an imaging apparatus including the imaging lens. The imaging lens includes, in order from an object side, as lenses having refractive power, only four lenses including a positive first lens L1, a negative second lens L2, a positive third lens L3, and a positive fourth lens L4. A conditional expression relating to a focal length fs1 of the first lens L1 with respect to s-line and a focal length fs of the entire system with respect to s-line: 0.5<fs1/fs<2.5 is satisfied.
Claims20
An imaging lens comprising, in order from an object side, as lenses having refractive power:
- only four lenses including a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power,
- wherein the following conditional expression (1) is satisfied;
- 0.5<fs1/fs<2.5 (1)
- where
- fs1:
- a focal length of the first lens with respect to s-line
- fs:
- a focal length of an entire system with respect to s-line.
Dependencies are inferred from the claim text.