Effective Focal Length

Famous quotes containing the words effective and/or length:

““More!” is as effective a revolutionary slogan as was ever invented by doctrinaires of discontent. The American, who cannot learn to want what he has, is a permanent revolutionary.”
—Eric Hoffer (1902–1983)

“No doubt, the short distance to which you can see in the woods, and the general twilight, would at length react on the inhabitants, and make them savages. The lakes also reveal the mountains, and give ample scope and range to our thought.”
—Henry David Thoreau (1817–1862)