A serial sex offender will remain behind bars.
Reginald Robert Young was found with 342 still images and videos of children in June 2016.
The material included girls as young as four and as old as 15.
The 26-year-old father pleaded guilty to one count of possessing child exploitation material in the Launceston Magistrates Court on Monday.
Magistrate Ken Stanton said most of the images were the lowest form of child exploitation, but at least two of the videos were “most serious”.
Young’s lawyer Evan Hughes previously told the court his client had a “large collection of legal pornography” and had a “healthy, natural interest in pornography”.
Mr Stanton said that did not excuse the crimes, but he accepted Young’s child exploitation material was a “small part” of a larger legal collection.
Young has previously been convicted for possessing child exploitation material and having sexual intercourse with a person under the age of 17.
He had already been placed on the Community Protection Offender Register for 20 years and was serving a sentence of four years when he appeared on Monday.
“While you weren’t the person who directly exploited the children … you have been the willing recipient of that exploitation,” Mr Stanton said.
He told Young a term of imprisonment was an “almost certain consequence” for such crimes.
Describing the defendant as “emotionally immature”, Mr Stanton said the death of his father at a young age and relationship breakdowns had contributed to his offending.
“You’re still a relatively young man … you have engaged in counselling,” Mr Stanton said.
Young was convicted and sentenced to six months in jail without parole.
He will serve that sentence on top of his current prison term.
He was placed on the register for five years, which will form part of his 20-year reporting order.