Green flash at sea
The green flash can sometimes be seen at sunrise or sunset. This one was captured at sunset from the Deck of the Rotterdam Cruise ship on Nov 23, 2011 while sailing in the Caribbean sea. A video of the event can be seen at -
http://vimeo.com/34386132
Details
Tripod mounted Canon T3i camera with 300mm f/4 L series image stablized lens.
Exposure 1/1000s at f/8 and ISO 400.
Processed in Photoshop with care taken to retain the color as captured.