1. Proper focus is the first step to a sharp image.

2. Try to hold the camera as steady as possible, exhaling steadily and gently as you squeeze the shutter button. Don't hold your breath.

3. Generally with most cameras your picture will blur if you try to take snaps with low light using auto focus. For advice on taking picture in low light conditions underwater with no flash or strobe refer to your camera's manufacturers' instructions.

4. The best colour results can be achieved by not exceeding a depth of 10 meters/30 feet. If you do not have a proper underwater flash or strobe system then you should not be any further away from your subject than half a meter/5 feet.

5. The easiest way for you to make your subject stands out clearly in an underwater photograph is to be slightly lower than your subject so that your camera is shooting at an upward angle.

6. Straight after taking each picture take a look around and ensure you know where your buddy is and that they are ok. Remember that your buddy is your lifeline and you are theirs. So ensure that your photography dive is one to remember as a happy memory and not a tragedy that you could have easily prevented.

Note: Remember to take care of the environment around you and don't bang into sensitive reefs or kick up clouds of silt. In some places underwater photographers have a bad reputation because they let photography get in the way of protecting the very world they're photographing.