Lens device
A lens, lens technology, used in optical components, optics, instruments, etc., to achieve the effect of large aperture, high resolution, and good optical performance
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[0053] A lens device provided according to various embodiments of the present invention includes: a first lens group, a second lens group, a third lens group and a fourth lens group. The first lens group includes a first lens with negative refractive power and a second lens with negative refractive power. The first lens includes a convex surface facing the image side and a concave surface facing the object side. The second lens group includes a third lens with positive refractive power, and the third lens includes a convex surface facing the object side. The third lens group includes a fourth lens having positive refractive power. The fourth lens group includes a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with positive refractive power. The seventh lens includes a convex side facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh le...
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