Reading the manual and you can change the ISO from auto which is what I have it on to 80/100/200/400/800/1600.Higher the value faster the shutter speed. Is ISO what you mean? I really don't know to much about camera's. The image size is set at 10M - Fine compression and some settings you change limit the size like Fine Zoom is limited to 5M. For movement shots I set the camera to "Sport" but I haven't taken many shots of movement yet "still have to make a livin". The only fish shots were posted, I wanted close-ups so fish that stay still were the subjects. But I plan to try more just busy person.
The camera does not have a extra outer housing, just what you see in the site provided buy cbui2.
Smellikefish the photo is of a type of Protopalythoa or Palythoa at least that is what I i.d. it as and it also wins for first purchase animal in the tank 7 years ago.
And Kimsie just remember to wash it after you use it your manual will walk you through proper procedure and what to worry about.