Despite arriving at an end sentence of 15 months, the judge declined home detention because the offending was too serious.
"Because of the serious nature of the offending and in particular the need to hold you accountable and to denounce and deter offending of this nature and to protect the community that a sentence of imprisonment is inevitable."
The charges were brought by the Department of Internal Affairs, whose Censorship Compliance Unit manager Steve O'Brien said the department was part of the global fight against the sexual abuse of children for the manufacture and distribution of objectionable images.
He said people could be traced, even if they only looked at the images on an internet site.