Just an FYI - some are referring to non objective abstract art which is different than abstract art or non representational art.
Almost anything that is not representational, might be able to be called abstract. I was taught that non objective abstract art is simply serendipity at it's finest, nothing recognizable or planned. The best example, in my opinion, of non objective abstract art would be something Pollock did, however, so are the works by Rothko considered abstract. Something like stick people drawings are considered abstract but not non objective abstract art. There's always been a battle between abstract and representational artists
In photography, I believe ANY photo can be turned into an abstract image in Post Processing, since some things like, Photoshop or Corel, have all the tools to create this. Trying to capture an image in an abstract style using different settings/techniques on a Digital camera, is the same thing as using Tri-X Film and Camera to take a Black and White photo...