Zoom lens assembly

A zoom lens assembly, sequentially comprising from an object side to an image side along an optical axis (10):

• a first lens group (G1);
• a second lens group (G2) with a positive refractive power, spaced from the first lens group (G1) by a first air space and movable on the optical axis (10);
• a third lens group (G3) with a positive refractive power, spaced from the second lens group (G2) by a second air space and movable on the optical axis (10);
• and
• a fourth lens group (G4), spaced from the third lens group (G3) by a third air space,
• wherein a Total Track Length (TTL) of the zoom lens assembly and a difference Δf between an effective focal length of the zoom lens assembly at a wide end and an effective focal length of the zoom lens assembly at a tele end satisfy 2.5<TTL/|Δf|<4.0;
• an effective focal length fw of the zoom lens assembly at the wide end and an effective focal length fG2 of the second lens group satisfy 0.5<fw/fG2<1.0.