I present an epistemological puzzle about perceptual knowledge and its relation to the evaluation of probabilities. It involves cases, concerning a given subject S and a proposition P in a determinate context, where apparently: S has perceptual knowledge of P ; the epistemic justification S has for believing Not- P is much greater than her epistemic justification for believing P . If those two theses were true, the following very plausible epistemological principle would fail: If S knows P , then the epistemic justification S has for believing Not- P is not greater than her epistemic justification for believing P . I offer a solution to the puzzle, which is compatible with basic intuitions and theses of orthodox Bayesianism.
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