An optical sensor comprising: an array of pixels configured to convert photons into electrons for forming an image; and a tunable filter assembly optically connected to the array of pixels for passing an adjustable bandwidth of photons to the array of pixels, wherein the tunable filter assembly includes: a first mirror defining an optical axis; a second mirror spaced apart from the first mirror along the optical axis; a first electrode mechanically connected to the first mirror; and a second electrode fixed relative to the second mirror, wherein the first and second electrodes (110, 112) are positioned relative to one another to adjust the position of the first mirror with respect to the second mirror when a voltage is applied across the first and second electrodes (110, 112) to tune the spectral bands being passed through the filter assembly to the array of pixels; a frame operatively connected between the first mirror and the first electrode, wherein the first electrode is connected to the top of a first portion of the frame and the first mirror is connected to a second portion of the frame, wherein the frame includes a plurality of spaced apart bridges connecting between the first and second portions of the frame to suspend the first mirror and the second portion of the frame over the second mirror; and a plurality of evenly spaced apart posts extending between the first and second electrodes to separate the first electrode apart from the second electrode in a direction parallel to the optical axis; wherein each of the bridges of the frame connect between the first and second portions of the frame midway between a respective pair of the posts, wherein the posts are positioned to allow flexure of the first electrode and the first portion of the frame in a direction parallel to the optical axis when a voltage is applied, thereby adjusting the position of the first mirror along the optical axis and tuning the adjustable bandwidth passing through the tunable filter assembly. an array of pixels configured to convert photons into electrons for forming an image; and a tunable filter assembly optically connected to the array of pixels for passing an adjustable bandwidth of photons to the array of pixels, wherein the tunable filter assembly includes: a first mirror defining an optical axis; a second mirror spaced apart from the first mirror along the optical axis; a first electrode mechanically connected to the first mirror; and a second electrode fixed relative to the second mirror, wherein the first and second electrodes (110, 112) are positioned relative to one another to adjust the position of the first mirror with respect to the second mirror when a voltage is applied across the first and second electrodes (110, 112) to tune the spectral bands being passed through the filter assembly to the array of pixels; a frame operatively connected between the first mirror and the first electrode, wherein the first electrode is connected to the top of a first portion of the frame and the first mirror is connected to a second portion of the frame, wherein the frame includes a plurality of spaced apart bridges connecting between the first and second portions of the frame to suspend the first mirror and the second portion of the frame over the second mirror; and a plurality of evenly spaced apart posts extending between the first and second electrodes to separate the first electrode apart from the second electrode in a direction parallel to the optical axis; wherein each of the bridges of the frame connect between the first and second portions of the frame midway between a respective pair of the posts, wherein the posts are positioned to allow flexure of the first electrode and the first portion of the frame in a direction parallel to the optical axis when a voltage is applied, thereby adjusting the position of the first mirror along the optical axis and tuning the adjustable bandwidth passing through the tunable filter assembly. a first mirror defining an optical axis; a second mirror spaced apart from the first mirror along the optical axis; a first electrode mechanically connected to the first mirror; and a second electrode fixed relative to the second mirror, wherein the first and second electrodes (110, 112) are positioned relative to one another to adjust the position of the first mirror with respect to the second mirror when a voltage is applied across the first and second electrodes (110, 112) to tune the spectral bands being passed through the filter assembly to the array of pixels; a frame operatively connected between the first mirror and the first electrode, wherein the first electrode is connected to the top of a first portion of the frame and the first mirror is connected to a second portion of the frame, wherein the frame includes a plurality of spaced apart bridges connecting between the first and second portions of the frame to suspend the first mirror and the second portion of the frame over the second mirror; and a plurality of evenly spaced apart posts extending between the first and second electrodes to separate the first electrode apart from the second electrode in a direction parallel to the optical axis; wherein each of the bridges of the frame connect between the first and second portions of the frame midway between a respective pair of the posts, wherein the posts are positioned to allow flexure of the first electrode and the first portion of the frame in a direction parallel to the optical axis when a voltage is applied, thereby adjusting the position of the first mirror along the optical axis and tuning the adjustable bandwidth passing through the tunable filter assembly.