V-Wiz wrote in post #11376740
Awesome, I love the group shot. Why is there a shadow, did you use a backdrop? lol.
Edit, is that the movement from the long exposure??
As Red Tie mentioned above it's long exposure mixed with Flash. Flash stopped the action, but since I was bringing so much Ambience in to pick up a scene you picked up movement shadows.
I'm actually kinda proud of that shot. Imagine sitting on a sandy beach, manually focusing your camera via the distance scale on your lens (fortunately in this case it was a 24 1.4 which has a pretty simple hyperfocal distance) because you can see anything. Directing 10+ people to stand in the cold Carribean Sea at 1:00~2:00 a.m. in the morning. The first thing I told them is "I can't see S#it right now, so I'm gonna give you a three count. Make sure you look towards me".
Had my girlfriend/assistant hold up a 1/1 - 2/3 powered 580 ex II up behind me as high is she can (She's only 5'2" so it was probably only 6'1/2") and took 1 photo every 5 seconds. For a total of 3~4 photos before I told everyone to come up.
It was absolutely fun, and the results aren't perfect, far from it actually, and I know most people who see it outside of this forum will immediately see more what's wrong with it technically than what's right....but I'm happy it came out the way it did 
Editing these photos next week, so you'll see more ump in them than.