This is a single image HDR from a 6x6 BW negative . It is a 3 exposure HDR done in post processing (-1,0,+1,) and it has additional contrast grading done in Lightroom. It is a good example of what can be achieved with single image HDR and contrast grading.
Single image HDR is often looked down upon as not 'real HDR' since traditional HDR is done in-camera with multiple exposures. While it is true single image HDR is not as good as traditional, multi exposure HDR, you can still benefit from single image HDR as many times it is not practical to shoot multiple exposures of a subject.
Sunlit Slipper 1974 L.A. - photo and post processing by D.D. Teoli Jr.