The Large Fiber Array Spectroscopic Telescope: prime focus corrector optics

The Large Fiber Array Spectroscopic Telescope (LFAST) is designed to be a cost-efficient way to provide a large collecting area for spectroscopy by duplicating large numbers of small (0.76m f/3.33) spherical mirror 'unit' telescopes. Each telescope is equipped with a prime focus corrector (PFC) feeding a guider and an optical fiber; and all the fiber optics will feed into a large spectrograph. The design of the PFC is driven by the need to minimize costs while achieving acceptable performance. We are currently constructing a prototype 20-unit system for testing in the second half of 2024. For this 20-unit system we have begun coordinating with industry about scaling for mass fabrication. In this paper we will present status updates from the performance of this early version of the prime focus corrector.