How to get manual focus Nikon 105 VR lens in Nexus housing

Hi, I'm buying the Nexus housing for my Nikon D200 camera and 105mm VR lens. I'm hearing that there's no focus switch knob s.m.c. on this housing.

Is there any other way to get the camera to focus manually or at least keep the focus once it's done so the lens doesn't keep going back and forth all the time in low light conditions?

Any ideas are welcome!

Thanks, Erika.

Contributed by Erika Antoniazzo added 2007-07-30

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The Byron Underwater Festival 2007: by Wandy Hochgrebe; The first Byron Underwater Festival, which was held May 10-13 was a great success with more than 30 divers entering in the Underwater Shoot-Out and over 100 artworks submitted to the ‘Marine Visions’ Art Competition. The aim of the event was and is to be more than just another digital shoot-out competition.