First you need to aquanaut you self with the controls on the camera, especially the controls the affect ISO, f Stop, and shutter speed, the triumvirate of exposure.Get a good book on exposure like Understanding Exposure: How to Shoot Great Photographs with a Film or Digital Camera by Bryan Peterson.Get an EXIF reader program so you can see the settings used for each image.Get out an shoot.Then learn about DOF, Depth of Field.
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