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U s i n g S L R C a m e r a s a n d C o m p a c t D i gi t a l s U n d e r w a t e r
Figure 25.1 M for manual focus, S for single servo and C for continuous on a typical SLR camera.
precise focusing. For my own underwater photography, I want to be in total control of the shutter release. I have lost count of the times when I have missed a wide-angle opportunity because the lens was hunting for the subject and I missed the shot. When using the 60-mm and 105-mm macros, the autofocus is fast and accurate. The focusing technology of recent SLR cameras used underwater with close-up and macro subjects, even in low light situations, is superb. Three settings, M, S and C, control the autofocus concept, and there is no doubt that this is where good composition can be won or lost, particularly when it relates to where to place the focal point of the picture.
‘ S ’ s t a n d s fo r s i n g l e s e r vo Single servo is ideal for shooting still life or very slow-moving subjects. Single servo is often referred to as shutter priority for that very reason. Whilst on S you cannot fire the shutter unless you have achieved sharp focus. To activate autofocus detection in the S mode, lightly depress the shutter on your camera housing. The lens begins to focus and locks sharp in the frame. Retaining pressure on the shutter release continues to lock focus. Depressing the shutter fully takes the picture. All popular cameras have at least five focusing areas, which cover the viewfinder frame. By using the ‘game pad console’ on the back of the camera, you can select between the five areas depending on the subject’s position in the viewfinder or your own choice of composition.