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Beth, let us try to make the process a little easier. When you want a lot of depth of field, use a high f stop like f16. Then let the camera set the shutter speed. If the shutter speed is too slow and you get less than crisp pictures, you need to go to a lower f stop such as f11, f8 or even lower. (it will depend on how much light you have on the subject) Your canon should have auto focus so let it do the hard work there. Just remember, as a rule of thumb the higher the f stop number the slower the shutter speed and vice versa... and there is lots of room to play any number of combinations of f stop and shutter speed.
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