1. A method for imaging a sample with an optical system having an input, the method comprising: receiving, along an optical axis of the input, light associated with said sample and having a first spectral distribution; spatially redirecting the received light into optical channels, each optical channel having a corresponding effective optical power; and detecting light that has transmitted through each of the optical channels with a photodetector such as to fill an aperture of the photodetector with a plurality of substantially non-overlapping images, of said sample, respectively corresponding to optical channels, wherein each optical channel is configured to transmit light having a first spectral distribution, and wherein different optical channels have different effective optical powers.