That's right, camp 4 is used by climbers (and as such has been designated a National Historic Landmark). The height of the El Cap wall climbing season is usually in May-June, when the weather is stable but not yet too hot, however, depending on the conditions, people sometimes start in April (that's when I climbed El Cap the first time). Half-Dome's face is usually climbed in summer, as it is higher and north facing.
I remember being impressed by the Half-Dome from the diving board image in the Ansel Adams gallery. It was in the back of the gallery, facing a window in the left. There was a bit of snow at the base of the Half-Dome face. It would seem that having a bit of snow there help delinate the face, which is why Ansel Adams would have gone up there in April, right ?
By the way, Keith's image, when seen large in the Mountain Room is also pretty impressive. It's difficult to appreciate the rock texture and the flowers in the crack on the jpg.
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