I know about Sella. He lost a lot of plates during the St Elias expedition, and took many of his most famous shots of the Baltoro Glacier when they were being chased by Gurkha soldiers. One of those, containing a row of expedition members on the expedition below, turned out to be a fake! Two different negs were involved, the actual panoramic shot itself, and an earlier neg of the climbers themselves, taken in the Alps. He dubbed them in so well that it would have never been recognized if the original negs hadn't been inspected. But if it were an authentic perspective of them, they would have been about 18 feet tall in that scene. Way better than it could have been done in PS.
The highest point Sella ever got with his big camera was over 22,000 ft on Chogolisa (Bride Peak, opposite K2). That's where Herman Buell fell off somewhere in the fog, when Kurt Diemberger was trying to fiind him. My nephew has been on expeditions with Kurt, and his favorite Himalayan climbing partner was kidnapped at the base camp of Chogolisa, and wrote a book about the incident.