A lens assembly comprising, in order from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7 with a common optical axis, wherein the lens assembly comprises not more than seven lens elements and wherein the lens elements have, starting with the first lens element L1, a power sign sequence of positive-negative-positive-negative-positive-positive-negative; an optical window; and an image sensor having a sensor diagonal length SDL, characterized in that the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view less than 90 degrees, wherein TTL/EFL < 1.100, wherein TTL/SDL < 0.64, wherein a normalized thickness standard deviation constant T_STD and a central thickness CT of at least three of the seven lens elements complies with T_STD / CT <0.065 mm -1, wherein a focal length f 1 of the first lens element L1 fulfills f 1 /EFL<0.95, wherein T_STD i for the i th lens element (Li) is equal to 1 RMO i 1 N ∑ k = 0 N NT i k ⋅ RMO i N − T _ AVG i 2 wherein T_AVGi is defined as 1 N ∑ k = 0 N NT i k ⋅ RMO i N wherein RMOi is an aperture radius of an object side surface LOi of the i th lens element (Li), wherein a normal thickness NT i (r) is a function of cylindrical polar coordinate r referring to the distance between the two surfaces of the i th lens element at coordinate r along the normal vector of the surface closer to an object, wherein k is a discrete variable that runs from 0 to N, 10. wherein N is an integer greater than a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and a seventh lens element L7 with a common optical axis, wherein the lens assembly comprises not more than seven lens elements and wherein the lens elements have, starting with the first lens element L1, a power sign sequence of positive-negative-positive-negative-positive-positive-negative; an optical window; and an image sensor having a sensor diagonal length SDL, characterized in that the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view less than 90 degrees, wherein TTL/EFL < 1.100, wherein TTL/SDL < 0.64, wherein a normalized thickness standard deviation constant T_STD and a central thickness CT of at least three of the seven lens elements complies with T_STD / CT <0.065 mm -1, wherein a focal length f 1 of the first lens element L1 fulfills f 1 /EFL<0.95, wherein T_STD i for the i th lens element (Li) is equal to 1 RMO i 1 N ∑ k = 0 N NT i k ⋅ RMO i N − T _ AVG i 2 wherein T_AVGi is defined as 1 N ∑ k = 0 N NT i k ⋅ RMO i N wherein RMOi is an aperture radius of an object side surface LOi of the i th lens element (Li), wherein a normal thickness NT i (r) is a function of cylindrical polar coordinate r referring to the distance between the two surfaces of the i th lens element at coordinate r along the normal vector of the surface closer to an object, wherein k is a discrete variable that runs from 0 to N, 10. wherein N is an integer greater than