Small, portable digital cameras that exceed the performance of an off-the-shelf Nikon using 35mm slide film are further away from current reality than the proposed NASA manned Mars mission, although I expect both to happen sometime during my lifetime.

The most interesting parts of the natural world are the edges, places where ocean meets land, meadow meets forest, timberline touches the heights.

And most of my early pictures failed but about one in a 100 somehow looked better than what I saw.

A lot of people think that when you have grand scenery, such as you have in Yosemite, that photography must be easy.

One of the biggest mistakes a photographer can make is to look at the real world and cling to the vain hope that next time his film will somehow bear a closer resemblance to it...If we limit our vision to the real world, we will forever be fighting on the minus side of things, working only too make our photographs equal to what we see out there, but no better.

At the heart of all photography is an urge to express our deepest personal feelings - to reveal our inner, hidden selves, to unlock the artist. Those of us who become photographers are never satisfied with just looking at someone else's expression of something that is dear to us. We must produce our own images, instead of buying postcards and photo books. We seek to make our own statements of individuality.

There is no question that photography has played a major role in the environmental movement.