I have a Nikon D5100 and I'm just learning how to use it. The lens cap is NOT on. I was trying to figure out how to adjust the ISO, aperture, and whatnot; but now the pictures all come out black when I'm in the manual mode. It takes pictures just fine in the other modes, but I can't adjust all these things in other modes. Is there something that I need to adjust in the manual mode to make the pictures turn out normally?
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