Not a true sepia...just used a brown filter to pull the dark blues of the water to an all brown/black/cream pallette using the Nik Color Efex filters and then I ran an Illustrated action on it to crisp it up a little more.
Canon 40D, 400mm f/5.6L
f8 @ 1/800, ISO 400
Manual mode, pattern metering, natural light
Processed in ACR & CS4, Nik filter used at the end; moderate crop.


