Without a specific picture, it's a little hard to tell.
But, Yosemite is full of scenes whose dynamic range pushes the limits of, or exceeds that of a DSLR.
This is why many shoot RAW, use split density filters, and/or employ HDR.
Though not the best example, here's kind of an example (excuse the JPG posterization artifacts) of 4 bracketed slots using HDR:
Exposed for foreground:
Exposed for sky :
HDR of 4 images (Plus a little more post processing):
|IMG_8168ABCD by citori525|
|McKinley meadow by TimR32225|
from Natural meadows
|_DSC2146 by jerste|
from Helios-44 II
|Leopoldsteinersee by RaCor|
from Landscape - Colour #3