1. A device for imaging a scene, comprising: (a) a detect of radiation from the scene, said detector including a plurality of detector elements, the radiation including a plurality of wavelength bands; (b) a circularly variable filter; (c) an optical system for focusing all the wavelength bands of said radiation onto said detector, said optical system including a first optical component and a second optical component; (d) a mechanism for rotating said circularly variable filter substantially perpendicular to an optical path of said radiation from the scene to said detector, and in an intermediate focal plane of said optical system, said intermediate focal plane being between said first and second optical components of said optical system; and (e) a data capture apparatus for: (i) repeatedly interrogating all said detector elements as a group while said mechanism rotates said circularly variable filter, thereby acquiring a plurality of acquired images of the scene, each said acquired image including a plurality of image portions, with each said image portion being acquired in a different respective spectral band of said circularly variable filter, and (ii) assembling said image portions to form a plurality of processed images of the scene with each processed image depicting the scene in a single said respective spectral band of said circularly variable filter.