One of the reasons I find this so galling is that so few people seem to be applying sound logic to this issue. There is a distinct difference between a theory and a fact. A theory is no more than a hypothesis, a guess, in layman's terms; conjecture; speculation. To be considered a fact, proof is necessary. Proof in this case would be inclusion of a camera obscura in the inventory of Vermeer's studio, and contemporary accounts from people who knew Vermeer. An inventory was made upon his death, and no such device was mentioned in that inventory. That constitutes evidence AGAINST the theory. There are no contemporary accounts mentioning any camera obscura in connection with Vermeer. Had he been in the habit of using it, it would be reasonable to expect some mention of it by someone contemporary with him, as he was well-known in Delft, and well-respected. Furthermore, his canvases have pinholes at the perspective vanishing points, indicating his method of working out the perspective using string pulled from the vanishing points to establish the angles of lines resolving at those vanishing points. The use of any projection device would have precluded the necessity of this procedure. Thus the pinholes are also evidence against the theory. I find it particularly disturbing that so many people are willing to accept these wordsmiths' speculations as sufficiently compelling to estabish an unproven hypothesis that is full of logical holes as fact in their minds.
The level of talent demonstrated in Vermeer's paintings warrants the utmost degree of respect. What he did cannot realistically be attributed to any device. Any Master-level artist deserves the benefit of the doubt where allegations of this sort might bear on his work and his abilities, and there is plenty of doubt in this case. I consider it terribly disrespectful to entertain any notion other than that Vermeer was a great talent, when there is no good reason to believe otherwise, and that talent is sufficient, all by itself, to explain excellence.
Virgil Elliott