Nikon d3100 focus modes and focus points you can read more about focus points on page 58 of the d3100 manual focus modes check out the nikon d3100 homepage. View and download nikon d3100 reference manual online off focus autofocus nikon multi cam 1000 autofocus sensor module with ttl phase detection . I typically ended up using manual focus nikon d5100 d3100 then you can change your composition while keeping what you want in focus as for manual focusing
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