PHOTO PRO continued
By positioning a strong foreground subject close to the dome port and lighting it with strobes, students can recover color while allowing the environment to fall naturally into the back- ground. This approach reduces the amount of water between camera and subject and helps minimize backscatter. As a simple guideline, we often teach students: If depth > 25 ft, shoot CFWA. This rule helps beginners avoid the common mistake of photographing distant subjects that quickly lose color and clarity. Once students can consistently produce clean, vibrant CFWA images with minimal backscatter, they can begin experi- menting with larger environmental scenes at depth. Of course, this rule is meant to be broken once students gain experience. Use the Histogram Regardless of lighting approach, students should learn to monitor their histogram rather than relying only on the camera’s LCD. If exposure data is pushed too far toward either side of the graph, detail is being lost in highlights or shadows. A balanced histogram helps preserve both the tonal range and natural at- mosphere of the scene. Camera Settings That Work In many vertical environments, we prefer to work relatively shallow whenever conditions allow. Shooting within the top 25 feet of the water column helps maintain lower ISO values, preserves color, and improves overall image quality. When introducing exposure settings, we typically encourage students to begin by setting their aperture first. A good starting point is f/8, adjusting toward f/13 or f/14 when greater depth of field is needed or when lighting conditions allow. Once aperture is established, shutter speed becomes the primary tool for balancing ambient light. For ambient-light scenes, we often recommend shutter speeds around 1/200 or faster. Many students don’t initially realize how much shutter speed influences the final image. A faster shutter speed can make the difference between a soft image and one that captures crisp detail in moving kelp, fish, or suspended particles. Teaching students to freeze motion with intention can dramatically improve their results. When strobes are introduced, particularly in close-focus wide- angle (CFWA) scenarios, photographers gain additional flexibility. Because strobe light freezes the foreground subject, slower shutter speeds can be used to preserve ambient light and background detail without sacrificing sharpness. As a general rule, we encourage students to keep ISO as low as possible and build their exposure using aperture and shutter speed first. In particulate-heavy water, instructors may also want to demon- strate how reducing strobe power, or even turning strobes off entirely, can sometimes produce cleaner images by minimizing
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