Multilayer optical film

A multilayer optical film comprising a plurality of optical repeat units, the optical repeat units in the plurality of optical repeat units numbering greater than about 10 in total, each of the optical repeat units comprising at least four sequentially arranged first through fourth individual layers, wherein for each of the optical repeat units:

• an average thickness of a same one of the first and third individual layers differs from an average thickness of each other layer of the first through fourth individual layers by at least a factor of 2.5;
• and
• the first and third individual layers have respective f-ratios f1 and f3 for respective indices of refraction nx1 and nx3 in a same in-plane x-direction,
• such that for a substantially normally incident light polarized along the x-direction, the multilayer optical film has a first order reflection band disposed at wavelengths greater than about 600 nm, the first order reflection band having a first reflection peak having a peak height Rp1, wherein any second order reflection band of the multilayer optical film has a reflection peak having a peak height Rp2 where Rp1/Rp2≥5, and wherein the ratio Rp1/Rp2 remains at least 5 when changing at least one of the f-ratios f1 and f3 continuously by 0.2.