Wow thanks alot to everyone for all your nice comments. I didnt expect such a great response. I dont much time these days to take photographs, so this is possibly my best ever result. Time to answer a few questions Ive read....
I was on a boat circling and a place called Seal Island, near Simonstown, South Africa. The area is known as 'the ring of death' due to the amount of hunting great whites that come to feed on cape fur seals that inhabit the island.
The boat drags a decoy seal behind the back of the boat so that the sharks cruising deep will storm to the surface and breach on what they assume is their prey.
I was at sea 7 days, a total of 30 hours was spent trying to capture a photo like this, that was in focus and in decent light conditions. Trying to hold a 1D steady for long periods of time on a rocking boat with salt water spraying around was hard at times.
In all that time we only managed 6 bites from sharks. I am very happy with the result, considering the time and cost I commited.
Thanks again!
The company operating the trip, even put my photo on their website...
http://www.ultimate-animals.com