Photographic lens system, image acquisition unit and electronic device

Abstract

Photographic lens system comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side;wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a negative refractive power, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fourth lens element (E4) has a positive refractive power, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) has at least one inflection point (P);where Nmin is a minimum value among the refractive indices of all lens elements of the photographic lens system, Fno is an aperture number of the photographic lens system, f is a focal length of the photographic lens system, f4 is a focal length of the fourth lens element (E4), f78 is a combined focal length of the seventh lens element (E7) and the eighth lens element (E8), and the following conditions are met: 0 < 10 × (Nmin − Fno) < 5.00; − 2.30 <f / f78<0; und0,30<f4 / f<1,50.;