Hi Chua,
Focal length is the "reach of your lens". It's normally indicated in XXmm. Focal length somehow differ for digital compact cameras and Digital SLR. i.e. 28mm on your DLSR will become something like 6mm on the digital compact camera. The longer the focal length, the narrower the scope of view.
Aperture is indicated by F stops, which is represented by values such as F2.8, F8.0 etc. This is the ring inside the lens that control the amount the light getting into the lens.
Shutter speed is the time at which the shutter opens and closes. It controls how long your media (digital or film) is exposed to the incoming light. Normally represented by 1/xx second or xx seconds.
If you indicate you camera band and model and show us a picture that you are not happy with, we'll help you sort out the problem.
Cheers,
I have dwarf cichlids in my tanks! Do you?
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