Review: Nikon Coolpix P5100: Its a retro review kind of week- this week goes back to 2007ish when I picked up my Nikon P5100 and the SB400 Speedlight. A replacement/sidegrade to my Canon S3IS, it started my journey with Nikon and this would last until 2014 when I switched to Sony for shooting. Originalyl intrigued by…