1. An image capture system comprising: a lens directed at a scene to be captured; a modulation stack comprising one or more digital light path length modulators, a digital light path length modulator comprising: a polarization modulator to receive light and to selectively modulate a polarization of the light; and an optical path length extender (OPLE) to direct the light having a first polarization through a first light path through the OPLE, and to direct the light having a second polarization through a second light path through the OPLE, the first and second light paths having different light path lengths; wherein the modulation stack adjusts the path length of the light by altering the polarization of the light between the one or more digital light path length modulators to create a plurality of light path lengths; and an image sensor to capture a plurality of image portions at a plurality of focal distances, from the data captured by the modulation stack, wherein a number of focal distances depends on the number of the one or more digital light path length modulators.