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WHEN TO USE A COMPACT 8" DOME PORT UNDERWATER
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Domes are essential underwater when shooting wide angle and zoom lenses. A flat port magnifies objects the same way your dive mask does, and it turns into a port hole when shooting wide lenses. The dome allows your camera to see the full angle of view, in most cases with no vignetting.
What is a Compact 8" Dome?
Domes can come in a variety of sizes, typically from 4" (100mm) diameter up to 10" (250mm) diameter or larger. Larger diameter domes provide better edge sharpness and less aberrations when using a rectilinear lens. Smaller diameter domes are easier to dive and travel with.
Our Compact 8" Dome is made from a section of a larger 8" diameter dome, blending the advantages of smaller and larger domes.
Ease of Travel
Certainly the first reason to choose a DL Compact 8" Dome Port is paring down your kit. The compact dome packs better. It can stand up vertically in most hard cases or you can travel with it attached to the housing. There's significantly less surface area to pad and protect from damage. Both our compact and full size 8" domes have the advantage of being over 4.5 pounds (1.7 kilograms) lighter than their glass counterparts with no significant reduction in image quality.
Handling
A more important advantage is the handling of the system. In some cases the buoyancy of the big dome can help make your system closer to neutral buoyancy and easier to handle. But it can also cause a continuous twist as the more buoyant dome port tries to float upward. The compact dome is closer to neutral buoyancy, which reduces the arm fatigue and may eliminate the need for trim weights.
Moving a few inches closer to the subject with a wide angle lens changes the perspective a lot. Remember that we are often holding our housing and strobes out in front of us to try and get the lens close to the subject without touching anything. Being able to support the system and capture an image with one hand can make a big difference.
Reduction of Drag
The drag of your system may seem like a fixed variable. But larger domes create significantly more drag. There is a noticeable difference when free diving, swimming against a current, or following fast moving subjects with a compact dome port.
