The problem with photographing giant sequoias (sequoiadendron giganteum) is that there is no way to make them fit the view of any distortion-less optics. One just has to shoot them piecewise, loosing much of the sense of awe which overwhelms you when standing under the giant and embracing all of it with a naked human eye - from the bark details of the lower trunk up to the branches barely visible in the clouds above.

Click here for an enlargement of the rightmost shot

Sequoia National Park, California, April 2007.