[KenByrne]

I've never used a focus gear. On my F60, D70 and now D80 all the lenses I used where autofocus lenses and they work fine underwater. Only occasional problem is lack of contrast for focusing in poor vis but a spotting torch helps with that. The autofocus usually works more accurately and faster than I can. Unless the Sea & Sea housing lets you disengage the manual focus control you can't use autofocus with the gear in place. If you do the camera has to drive the manual focus controls on the housing and the motors aren't built for it.