Photographing optical lens system, image capturing unit and electronic device

A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, and each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

• wherein the object-side surface of the first lens element is concave in a paraxial region thereof, the image-side surface of the first lens element is convex in a paraxial region thereof, the sixth lens element has positive refractive power, the object-side surface of the sixth lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element is convex in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens system has at least one inflection point;
• wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, an axial distance between an object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the photographing optical lens system is EPD, and the following conditions are satisfied:
• 0.30<(V3+V5)/V4<1.2;
• and
• 1.0<TL/EPD<6.0.

A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, and each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

• wherein the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the object-side surface of the sixth lens element is concave in a paraxial region thereof, the image-side surface of the sixth lens element is convex in a paraxial region thereof, the seventh lens element has negative refractive power, and at least one of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens system has at least one inflection point;
• wherein an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, a central thickness of the sixth lens element is CT6, a central thickness of the seventh lens element is CT7, an axial distance between the sixth lens element and the seventh lens element is T67, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, and the following conditions are satisfied:
• 0.40<(V3+V5)/V4<1.0;
• 1.5<(CT6+CT7)/T67<13;
• and
• 2.2<|f1/f4|.