A harvester includes an auger tube having a first portion and a second portionadjacentthe first portion, an auger flight within the first portion of the tube andterminating priorto the second portion to move grain to the second portion, a window along thesecondportion of the tube and a camera to capture images of grain within the secondportion ofthe tube. A computing device determines grain mass flow based upon thecapturedimages, a dimension of the second portion of the tube and a grain densityfactor.
