My Great niece Mikala is 8 years old and loves to take photos. She has been doing it for at least three years now. She has had several little P&S digital cameras. Recently I borrowed a little Nikon from my friend Beth. She was here this weekend and just had to take some photos. I know I am biased but she does do good for an 8 YO.
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I showed her one time how to turn it on, zoom in or out, acquire focus and set macros mode and she was off. Teach your kid the things you love, if they have an interest nurture it. Then you both have something to share.