Conor Sayres (UW) and I spoke again today about the fiber positioning system (fiber robots) that lives in the two focal planes of the two telescopes that take data for SDSS-V. One of the many things we talked about is how precisely do we need to position the fibers, and how accurately will we be able to observe their positions in real time. It's interestingly marginal; the accuracy with which the focal-plane viewing system (literally a camera in the telescope that looks the wrong way) will be able to locate the fiber positions depends on details that we don't yet know about the camera, the optics, the fiducial-fiber illumination system, and so on. There are different kinds of sensible procedures for observatory operations that depend very strongly on the accuracy of the focal-viewing system.
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