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Nowhere on that page is the lens discussed. All it says is "on a glass plate." I'm assuming that someone used a relatively small scope to take the picture, one equipped with a plate camera and the ability to point to a slightly negative altitude.
Maybe on one of the high mtns in the Diablo Range but from the floor of the central valley? It's definitely one of those shots that needs to be proven.
So, do you believe the Mt. Hamilton shot, or not?
As for proof of visibility from areas in the central valley, well, how much do you need? Scroll up a few posts to see evosia's gob of pictures. Do all these 'need to be proven' ?
Why is is so difficult for several of you folks to consider the possibility?
The guy in the picture was on a lunch break from working in Curry Village, he just teleported through that magic 400mm lens.
This was taken with a focal length of about 100mm, how high up is the far mtns? How far back or how high do you have to be to see half dome?
PS, it's not a master piece, I'm only human.
Remember that the valley, while wide, will also be radically foreshortened due to the angle of view, as well as the curvature of the Earth. The thin band of haze just shy of the coastal ranges could easily conceal tens of miles of valley floor.