In the late 70s I attended an Adams exhibit at the Krannert Center, University of Illinois, Urbana. Like an idiot, I went near the end of the run, which meant being shoulder-to-shoulder with other late-comers. On my right, as we moved around the exhibit, were an early 30-something guy and his father. They were obviously dilletantes, and made all sorts of inane comments. I was pretty frustrated, but held my tongue. Until, that is, we got to a 30x40-ish print from an negative made in the early 40s. These two clowns pushed their noses up close to the print and the young-un opined "Yeah, that's 35mm!".
I couldn't stand it any more, so I stated directly, "No, that's at least 4x5, probebly more like 5x7 or 8x10."
"Oh, do you think so?" the young gun asked, as if "Who the f*@k are you?".
"No," I replied, "I KNOW so. In the first place, at that time Ansel didn't do much 35mm work. Second, there was no 35mm film made at that time that could produce this."
A sheepish "Oh." was the reply.
I felt real, real good.
Many years later, attending an Adams exhibt at the Ansel Adams gallery in SF, I got the same sense of awe and joy... without the idiots by my side.
Earl