Child porn man wants sentence cut

A Hobart man caught with 145,000 child pornography images wants his five-and-a-half year sentence reduced.

Michael John Coulbourn was tracked by the FBI during a global investigation into online child exploitation.

The 49-year-old was jailed last August after pleading guilty to possessing child exploitation material and using a carriage service to access it.

When police searched the former public servant's Moonah home last year, they found pornography involving children as young as six months.

The prosecution described the crime as one of the worst of its kind Tasmania has seen.

The Hobart Criminal Court heard Coulbourn was suspended from his job with the Tasmanian public service after his arrest and has since resigned.

He is now appealing against his jail sentence, on the grounds that it is excessive.