New answers tagged nikon-d3100
I use a Nikon D3000 which should be similar. In the camera menu (shooting menu, I think) you can control the power of the flash manually. Change the flash to manual rather than TTL, then set the power you would like (e.g. 1/2, 1/4, etc.). It's slow, and I can't think of a quicker way for the on-camera flash, but it will at least allow you to use it. ...
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