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I once attended a lecture by Stork that very convincingly disproved this thesis. But Hockey was not there to defend it. At least it allowed a lot of non trivia

• greglindahl 9y ago
  > David Stork, an imaging scientist and former Stanford professor with a side career in computer-aided art analysis, was the major scientific critic of Hockney and Steadman a decade ago. One of his main counterarguments was that, using only a camera obscura, Vermeer would have had to paint upside down and the projected image would be too dim to be useful. Jenison figured out that using a second mirror solves both problems. So in his apparatus, the image is projected through the 4-inch lens onto a 7-inch concave mirror on the opposite wall, and then onto the 2-inch-by-4-inch mirror he’d have right in front of his face as he painted. https://www.vanityfair.com/culture/2013/11/vermeer-secret-tool-mirrors-lenses https://www.vanityfair.com/culture/2013/11/vermeer-secret-to...
• wkowalsky 9y ago
  Stork discusses some of his criticisms of Hockney in this Youtube video: https://www.youtube.com/watch?v=rbL_Y-hZh20 https://www.youtube.com/watch?v=rbL_Y-hZh20