This camera is going to be mounted onto a telescope. You can think of the telescope (specifically, the three large mirrors that guide the light to the camera) a

This camera is going to be mounted onto a telescope. You can think of the telescope (specifically, the three large mirrors that guide the light to the camera) as the lens of your DSLR, and this thing as the CCD behind the lens. The one complication is that this camera itself has a few lenses, which are the final elements in the optical system. There's more information about the optical system for Vera Rubin / LSST here: https://www.lsst.org/about/tel-site/optical_design https://www.lsst.org/about/tel-site/optical_design