Lens module and image apparatus

A zoom lens, comprising:

• arranged in sequence, from a first side to a second side, a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group,
• the first lens group with positive refractive-power;
• the second lens group with negative refractive-power;
• the third lens group with positive refractive-power, the third lens group comprising a cemented lens formed of three lenses;
• the fourth lens group with positive refractive-power;
• and
• the fifth lens group with positive refractive-power, wherein the fifth lens group comprises at least one lens with refractive-power, and the at least one lens with refractive-power in the fifth lens group is not movable respect to the cemented lens of the third lens group in a zoom process and a non-zoom process;
• wherein the first lens group, the third lens group, and the fifth lens group are fixed groups, and the second lens group and the fourth lens group are movable groups;
• the second lens group approaches the third lens group along an optical-axis of the zoom lens and the fourth lens group approaches the third lens group along the optical-axis, such that the zoom lens shifts from a wide-end to a tele-end.