From AaronRoodman https://twitter.com/AaronRoodman on Twitter: View into the @LSST Camera cryostat at @SLAClab. Ten percent of the Focal Plane is currently loaded with engineering grade image sensors, to be put into operation for system testing in the new year. https://twitter.com/AaronRoodman/status/1075898942125006848/photo/1 https://chirp.cooleysekula.net/attachment/53130