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Macro lenses for digital housings
Most consumer digital cameras have a macro or extreme close up facility built in. This lets you photograph tiny subjects like Nudibranchs or Porcelain crabs for instance. However there may be limitations on how close you can really shoot underwater because of internal flash limitations. Some cameras don’t permit the use of flash at very near distances because the flash cannot light the whole frame evenly.
Macro lenses can be attached to your housing via a screw thread or an adapter. They allow you to shoot from further back while still filling the frame. This lets you use your built in flash or an off camera strobe as you prefer. You can also use much of your zoom range for more control over the final composition. Keeping your distance also helps to avoid damaging coral and can make shy creatures easier to photograph.