D90. Pictures of pet birds. The lighting in the room I take pictures in is good so at shutter speed of 125 with the 50mm f1.8 set to f 2.8 I am able to get nice and bright pictures BUT they are not as sharp as the ones at shutter speed of 250 with the bounce flash. So this means pics taken with flash are always sharper than pics without? Is it the shutter speed making them sharper? Or the flash? I thought the whole point of fast lenses was that you could get by without flash. But they are just not sharp enough!!