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Photography is full of trade offs, don't forget an SLR set up is a system, and like any system unless the components are balanced there will be a bottleneck in performance, currently that bottleneck is your lens. Bright light will allow you to have a fast shutter speed with an aperture of F4, quite why it was shot at iso1600 i can't quite fathom, was the light poor?
Also don't rely on auto set it to manual get used to your camera its certainly a capable body, try a variety of settings soon you will build up a good knowledge and it will become second nature.
Also, are you shooting RAW files, they contain more data and when converted have less noise. If you have any examples of your shots post them here so we have a better idea of your troubles.
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