I.e. Tim's Vermeer copies are held up as examples of how anyone can paint like Vermeer given the tools, whereas to me a direct comparison makes it even more clear how perfectly Vermeer chose when to use a technological aid and when to change things:
http://flyingfox.jonathanjanson.com/wp-content/uploads/2014/...
Things like the bluriness of the paintings in the background and the slightly softer and more abstracted faces, the additional creams and blue tints in the whites of the walls, the blues that are picked out in the rug in the foreground, etc are what make me love Vermeer so much, not that he's photorealistic.
Anyway, I realize I'm constructing a partial strawman here because I don't think people like David Hockney or others supporting the optical argument are trying to claim that Vermeer is less talented than we thought, but it does seem like the press sometimes spins it that way.
As an aside, one of the only paintings of Carel Fabritius to escape the gunpowder explosion that killed him as well (made more famous recently by Donna Tartt's 'The Goldfinch') is a really cool example of a painting from the time that was clearly made using lenses. It looks to my eyes more or less exactly like a photo made using the iPhone's panoramic setting. Would be really cool if someone could find the same location in Delft and take the same type of image:
https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Fa...
Questions like this are why, I think, realism became less valued on its own in the art world, after the advent of photography. Then it became merely about how the painting looked, rather than how difficult it was to produce.
The more I think of this stuff the more I love it as an example of the incremental nature of technology - photography wasn't just invented in a certain year, it was a process over about two centuries of experimenting with ways of replicating images that finally converged with advances in chemistry to lead to a breakthrough that we then demarcate as the beginning of a new era. But in some ways it was just the culmination of a process of optical and artistic tinkering that goes back to the early Renaissance (or arguably even earlier, with Grosseteste's experiments with lenses in 13th century Oxford).
I find technological cleverness, and maybe a bit of hustle, more fascinating aptitudes than mere technical skill.
(Or maybe that's still disappointing, because I'm similarly focusing on technical choices rather than artistic choices, just going the other direction...)
https://en.wikipedia.org/wiki/Hockney%E2%80%93Falco_thesis
I recall this thesis was quite disruptive within the world of art history; there was significant (and vocal) pushback from people who had spent their lives researching these famed artists who were now being confronted with the use of aids (I make no comment here as to any impact on the 'art'). Articles were published in both art history publications and IEEE journals.
Falco was a professor of mine in graduate school, and is both a great lecturer in his field and unique in the breadth of his outside interests.
I think why I found this topic particularly fascinating was that it took the combination of an artist (Hockney) to start the hypothesis -- the paintings were too "real" to his experienced eyes -- and a physicist (Falco) to confirm the theory through scientific analysis (along with some art history!).
It just said that with the technology available at that time it was possible for him to use optics. There is a big gap between that statement and the claim that he did actually use it.
He had the means to by a gun, hence he is the murderer.
May be there indeed is mounting evidence, but I could not catch it in the article. Unless by evidence the author means the scale of his detailed portraits, but that has been known for a while.
And a painter like Rembrandt would not be able to adjust for this, by moving the painted eyes a few millimeters? I can't believe that.
Also, I do not rule out that he didn't want the eerie feeling you can get from a portrait where the subject looks straight at you (https://researchnews.osu.edu/archive/eyefolow.htm)