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The two main things that affect your exposure are shutter speed and aperture (well, and ISO, but let's ignore that for now). You've already figured out shutter speed, but apparently not aperture.
Aperture is how wide the opening in your lens is. Wider opening, more light, you can use a higher shutter speed. Narrower opening, less light, longer shutter speed required. Aperture has a much, much smaller range of available settings than shutter speed does, and it's lens-dependent. For reasons I'm too lazy to explain right now, lower f/numbers are wider apertures.
f/2.8 is probably the maximum your camera can do, so your shutter speed is limited by that.
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