The primate went to investigate the equipment before becoming fascinated with his own reflection in the lens.
And it wasn't long before the crested black macaque hijacked the camera and started snapping away sending award-winning photographer David Slater bananas.
David, 46, said: "One of them must have accidentally knocked the camera and set it off because the sound caused a bit of a frenzy.
"At first there was a lot of grimacing with their teeth showing because it was probably the first time they had ever seen a reflection.
"They were quite mischievous jumping all over my equipment, and it looked like they were already posing for the camera when one hit the button.
"The sound got his attention and he kept pressing it. At first it scared the rest of them away but they soon came back - it was amazing to watch.
"He must have taken hundreds of pictures by the time I got my camera back, but not very many were in focus. He obviously hadn't worked that out yet.
"I wish I could have stayed longer as he probably would have taken a full family album."
David, from Coleford, Gloucestershire, was on a trip to a small national park north of the Indonesian island of Sulawesi when he met the incredibly friendly bunch.
The crested black macaque is extremely rare and critically endangered. These were part of a study group near a science base in the region, home to researchers from Holland.
David added: "I teamed up with a local guide because I knew about the apes and wanted to photograph them.
"I walked with them for about three days in a row. They befriended us and showed absolutely no aggression - they were just interested in the things I was carrying.
"They aren't known for being particularly clever like chimps, just inquisitive.
"Despite probably never having any contact with humans before they didn't feel threatened by our presence, and that's why I could walk with them during the day."
Selfie (en inglés) o autorretrato realizado por macaco, con la cámara de David Slater, esta es una de las fotos en disputa.

Wikimedia Commons y su organización parental Wikimedia Foundations se vieron envueltas en una batalla legal por derecho de propiedad intelectual por la publicación de una foto autorretrato o selfie (en inglés), realizada por un macaco. El fotógrafo inglés David Slater consiguió estas fotos al encontrarse en  en 2011, cuando un grupo de macacos robó su cámara y entre cientos de fotos realizó  este y otros autorretratos. Las imágenes fueron subidas a Wikimedia Commons, y a pesar que el fotógrafo solicitó su remoción reiteradas veces, en Wikimedia se negaron, alegando que el macaco debería ser el verdadero dueño de la foto ya que este fue quien apretó el botón de la cámara.



El fotógrafo inició un juicio a Wikimedia alegando que colocar las imágenes en  le ha significado una pérdida de 10 000 libras inglesas. Sin embargo, en Wikimedia se alega que él no posee los derechos de autor ya que no sacó la foto.