主权项 |
1. An imaging lens comprising first, second, third, and fourth lens elements arranged in order from an object side to an imaging side, each of the first, second, third, and fourth lens elements having an object side surface facing toward the object side, and an imaging side surface facing toward the imaging side, wherein,
30<vd1−vd2; 0.4<d3avg/d4avg<0.7; and a ratio of a ratio between a sag at 5 percent point and a sag at 100 percent point of the imaging-side surface of the first lens element is in a range from −0.0082 to 0.0114. |