Hi Ken,Welcome to Nikonians!>I am new poster,just beginning to take pictures with a D5100>1st tried night shots during Geminid meteor shower, no meteors>and had a hard time w/ focusThe AF system need light and an AF target with contrast.The nightime sky has neither.Seting the focus to Manual should solve your focus problem.>Next used it for a 100th birthday party indoors at a>resteraunt>I used the 18-70 kit lens and the pop up flash, everything on>auto. I was not pleased with the color, lighting or focusThe color and lighting sound like a White Balance issue.The focus issue could be caused by using a AF Target without a lot of contrast. Was the subject you were focusing on in focus?If so, it could be the result narrow DOF if you were shooting with the aperture wide open.>Then back at the house I tried using the video mode on auto>and found later that everyone had skin tones that make the>look like smurfs (blue)Again, it sound like the White Balance is set to something other than Auto.Good Luck and Enjoy your Nikons!
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