Spectrometry system with visible aiming beam

An apparatus to measure spectra of a sample, comprising:

• a lens array comprising a plurality of lenses, the lens array configured to receive light from the sample;
• an image sensor comprising a plurality of sensor areas, the image sensor configured to receive light transmitted through the lens array;
• a support array disposed between the lens array and the image sensor, the support array comprising a plurality of channels configured to optically isolate light within each channel;
• wherein each channel comprises a first opening facing the lens array, a second opening facing the image sensor, and a channel wall extending between the first opening and the second opening, and
• wherein the channel wall of each channel extends from a lens of the lens array to a sensor area of the image sensor, such that light exiting from the second opening of each channel forms a pattern of light on each sensor area that substantially matches the size and shape of the second opening of the channel.