Tim’s Vermeer is a recent documentary feature ﬁlm following engineer and self-described non-artist Tim Jenison’s extensive eﬀorts to “paint a Vermeer” by means of a novel optical telescope and mirror-comparator procedure. His eﬀorts were inspired by the controversial claim that some Western painters as early as 1420 secretly built optical devices and traced passages in projected images during the execution of some of their works, thereby achieving a novel and compelling “optical look.” We examine the proposed telescope optics in historical perspective, the diﬃculty and eﬃcacy of the mirror comparator procedure as revealed by an independent artist/copyist’s attempts to replicate the procedure, and the particular visual evidence adduced in support of the comparator hypothesis. Speciﬁcally, we ﬁnd that the luminance gradient along the rear wall in the duplicate painting is far from being rare or diﬃcult to achieve, as was claimed; in fact, such gradients appear in numerous Old Master paintings that show no ancillary evidence of having been executed with optics. There is indeed a slight bowing of a single contour in the Vermeer original, which one would nominally expect to be straight; however, the optical explanation for this bowing implies numerous other lines would be similarly bowed, but in fact all are straight. The proposed method does not explain some of the most compelling “optical” evidence in Vermeer’s works, such as the small disk-shaped highlights, which appear like the blur spots that arise in an out-of-focus projected image. Likewise, the comparator-based explanations for the presence of pinprick holes at central vanishing points, and the presence of underdrawings and pentimenti in several of Vermeer’s works, have more plausible non-optical explanations. Finally, an independent experimental attempt to replicate the procedure fails overall to provide support for the telescope claim. In light of these considerations and evidence we conclude that it is extremely unlikely that Vermeer used the proposed mirror-comparator procedure.