Matters needing attention in underwater photography

The best shooting time is around noon, and the camera needs a protective cover when shooting underwater. It is best to shoot underwater at sunny noon, because at this time, the sun is above, and the sun shines almost vertically on the water surface, with little reflection and the strongest light in the water; Pay attention to the refraction of light by water. Never think that the distance you see underwater is the actual distance. Because the refraction of water to light is about 1.33 times that of air to light, the object in water looks 1.25 times larger than the actual volume, and the sight distance is about 25%.

It is appropriate to choose medium and high speed film, because the light in water is weak, it is difficult to stabilize the camera when swimming in water, and it is difficult to solidify the picture with low speed film; The auxiliary light source is essential for the water depth of 10 meter. Only by using auxiliary light sources such as flash lamps can the correct color reproduction of photos be guaranteed. There are also suspended particles in the transparent water closer to the subject, and the farther away from the subject, the worse the definition of the photo. So try to use a wide-angle lens and shoot close to the subject.