The best replacement for nikon l820 is canon sx510.

The best alternatives to nikon l820 are rated as following:
★★★★★  canon sx510
★★★★★  p520
★★★★★  canon sx500
★★★★  canon sx50
★★★  sony h200
★★★  l320
★★★  l810
★★  canon sx170
★★  canon sx280
★  fujifilm s8200
★  canon sx160
★  nikon p520
★  nikon l830
★  fujifilm s4800
  sony h300
  sony dsc h200
  sony hx300

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Speaking about nikon l820, one probably shouldn't forget about canon sx500.

Other search terms related to nikon l820 and their ratings are:
★★★★★ canon sx500
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nikon l820
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