1. An imaging system for imaging an object within an extended depth-of-field (EDOF) at an imaging wavelength λ, comprising: an optical system having an optical axis and consisting of a single lens element having a focal length F, an axial thickness TH wherein 0.25F≦TH≦1.2F, an amount of field curvature FC wherein 20 microns≦FC≦300 microns, an aperture stop arranged objectwise of the single lens element, and an amount of spherical aberration SA wherein 0.2λ≦SA≦2λ when forming an image of the object; and an image sensor arranged to receive the image and form therefrom a digitized electronic raw image.