Photographing Reflections underwater
Fish swimming near a smooth surface are perfect candidates for a reflection shot. Reflections are best shot when the surface is calm, visibility is good and the wind is not too strong. Early morning is a perfect time. Most important is the angle of the shot - read the photography tips below.

Underwater reflection, photo by Todd Winner. Nikon D2X, 12-24mm lens @12mm, ISO 100, 1/200, f/13. Getting close to the surface of the pool and having the correct angle with the water allowed Todd to capture a compete reflection.

Mirror reflection shot near the surface at Catalina Island.

Juvenile loggerhead turtle, right after being released in the open ocean from a rehab center. Photo by Kelly Bracken, while snorkeling. Nikon 17-35mm lens. The turtle was a couple inches from the dome port. These little guys were fast movers and it was hard work to get this shot. Strobes were on low power, and pulled back to avoid overexposing the turtle. Calm early morning conditions helped create a nice reflection.

Baby flying fish, at the surface, spotted from the boat. Photo by Keri Wilk. F32, 1/200th, ISO 1000. d300 + 105mm. The ISO 1000 was by accident, previously set from some cave photography. When Keri saw the flying fish in the water, he quicky grabbed the camera and jumped in.

Baby Mola-mola with reflection. The angle was a little greater than 48 degrees, and there was a little bit of wave action, so you get a mix of reflection and surface in the photo.
Photography Tips on shooting reflections underwater
- Reflections are best when the surface is calm, clear, and there is little wind - such as early morning
- According to physics your angle from the surface must be less than 48 degrees to get a full reflection. For example, If you are right under the subject, you won't get a reflection. Past 48 degrees, as you move away from the subject and towards the surface, you will.
- Try to find subjects close to the surface
- Don't be afraid to snorkel to find subjects at the surface with reflections
- Be careful to control your breathing, bubbles can disturb the surface. Keri Wilk gave me this advice, and he sometimes will overweight himself to make it easier to hold his breathe.
- You need to be somewhere where there are subjects on the surface. The indo-pacific region is a great place for this, especially at night when you are on a boat with it's lights on, the lights will often attract lots of marine life to the surface at night.
Further Reading
Shooting natural light underwater
Dive planning and research to photograph behavior
I was always under the impression that the critical angle water/air interface was 48.6 degrees per a derivation I did long time ago in college.
Something like
ni sin theta = nt sin 90 where ni is the water index of refraction and theta is the critical angle and nt is the air index of refraction.
air index is 1 and salt water index is 1.33 or so and adding salt only adds to index but only in the fifth decimal place.
But maybe that is wrong. Where does 42 degrees come from. Inquiring minds want to know
Bill
Bill Van Antwerp
Canon/Nauticam/Subal/Inon Lots of glass
visit http://www.blueviews.net
I seem to remember 42 degrees from speaking with Keri. But your right, the proper equation gives 48 degrees. I'll clear it up the next time I speak with him, and for now I've changed it in the text to 48 degrees.
Scott Gietler Owner/Editor, Underwater Photography Guide
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