Contour shuts its doors.  Nikon calls off profit targets, blames poor adoption outside Japan of mirrorless cameras.  Nikon 18-140.  Nikon SB-300 flash.  Olympus PEN sales drop 12%.  Canon to acquire a medium format line?  Canon has new firmware for the C300.  DP Review likes the Sigma 17-70/2.8-4 as an alternative to manufacturer kit lenses.