Authentic or Fake?

There is much debate over the authenticity of the supposed photograph of Crazy Horse. It is claimed to be taken at Fort Robinson, a few days before his death. But Lakota people are able to report, that Crazy Horse resisted being photographed during his life because he had strong beliefs in preserving the culture and ways of the traditional Native Americans. And they remind that during Tashuncas time cameras were big bulky things and exposure times were so long, that there was no chance for a "candid" or chance photograph.