The HiRISE focal plane
![The HiRISE focal plane](https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x792_crop_center-center_82_line/20140201_hirise_focal_plane_04-1058d.jpg 1200w, https://planetary.s3.amazonaws.com/web/assets/pictures/_768x506_crop_center-center_60_line/20140201_hirise_focal_plane_04-1058d.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x380_crop_center-center_60_line/20140201_hirise_focal_plane_04-1058d.jpg 576w)
At this point in the HiRISE assembly the detector elements are bare but are correctly aligned, set to the same height, and measured so that the locations of the pixels is known to an accuracy of a few microns. Later a metal cover was installed that had spectral filters, sharp-edged rectangular apertures, and stray light baffling. NASA / JPL-Caltech / UA / courtesy of Timothy Reed