Not since 1971 has one person earned two noms in Oscar’s cinematography category in the same year. This year, British d.p. Deakins could conceivably get three. Will the Academy go for the sun-bleached desert nihilism of “No Country for Old Men”? How about the lyrical Old West poetry of “The Assassination of Jesse James … “? Or maybe the post-traumatic pessimism of “In the Valley of Elah” is more its speed? With such exceptional credits, 2007 could be the year the five-time nominee finally earns a trophy.