Camera for pics

I have a Sony 4 MP camera, but it only has about a 6 x zoom. I tried to take pics of my 1853 $1, but couldn't get very good ones like I see on here all the time. Am I doing something wrong or is it just my camera? How can I get super sized pics of just the coin like I see on here all the time?
Beginner that wants to learn.
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Comments
Russ, NCNE
in the larger formats. Check it out.
bob