Besides the main flash modes listed above, the Nikon D3100's onboard speedlight can also be used in manual mode, in which you can set its power output to fixed levels of full, 1/2, 1/4 ...

Manual Focusing in Live view Mode During manual focusing, the Live view display on the Nikon D3100 can be magnified quite considerably, but it seems it's not all that you might expect from the ...