The 48-year-old had personalised many of the images by placing the head of the victims on sexualised internet photos. The guilty man also made numerous recordings of his teenage stepdaughter and her friends.
Police and Internal Affairs uncovered the man made 19 separate covert recordings throughout 2009 and 2010 in the bathroom of his Havelock North home, which he shared with his wife and step-children.
In 2012 he and his family moved to Hastings were he again set up a hidden camera and recorded on 14 occasions his stepdaughter, stepson and two teenage girls in the bathroom.
A series of 20 "highly disturbing" photographs were also taken sometime prior to August 23, 2010 of his then 15-year-old stepdaughter as she slept.
The stepdaughter had been having "trouble sleeping" at the time and the man has given her sleeping tablets for the complaint.
A similar series of photos were taken of his stepdaughter and her friend, who was staying overnight.
The investigation into the Hastings man also found "strikingly similar" photos taken a decade earlier in the late 1990s when the man lived in Auckland.
The man was caught by an undercover operative on an online chat site, where the 48-year-old man expressed in sickening detail his daily routines.
Judge Tony Adeane allowed the man to keep his name suppression while denying media from taking his photo because of the potential harmful impact on his victims.
He was remanded on bail until sentencing at Hastings District Court on October 22.
