= Lyot stop
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A <Lyot stop> is a mask in the reimaged <optical pupil> after a <coronagraphic focal plane mask>. For an unobstructed circular <entrance pupil>, it usually transmits a smaller concentric disk. In a classical <Lyot coronagraph>, much of the residual stellar field lies near the <optical pupil> boundary; the <Lyot stop> rejects that field before the final image is formed. It also rejects useful off-axis <light>, so choosing its opening involves a <coronagraph throughput> tradeoff. https://ao.jpl.nasa.gov/Publications/Technical/2001ApJ.sivaramakrishnan.AO.pdf[Sivaramakrishnan et al., 2001, §2.1]{ref}.
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