The invention discloses a
zoom telecentric lens and an imaging device. The
zoom telecentric lens comprises a front optical group arranged in a front lens cone and a rear optical group arranged in a rear lens cone. The front optical group is a fixed group, the rear optical group is a movable group, a diaphragm is arranged between the front optical group and the rear optical group, and the distancebetween the diaphragm and an
image plane meets a condition that L / beta is greater than 10 and is less than 30. The rear optical group comprises a sixth lens, a seventh lens and an eighth lens which are sequentially arranged in the incident direction of light, the variable quantity of the distance from the eighth lens to the
image plane meets the equation that deltaL4=16.99 (beta2-beta1), the
refractive index range of all the lenses in the rear optical group is 1.65-1.75, and an
Abbe number range is 30-55. According to the invention, random
zoom of the
telecentric lens between 2.5 times-10 times is realized by changing the intervals among the diaphragm, the rear optical group and the
image plane, the design pressure and the production cost of the telecentric lens are reduced, the
assembly process of a telecentric lens zoom
system is simplified, and a user experience is improved.