A Sydney man who filmed himself committing more than 100 child sex offences has been jailed for at least 26 years.

Former disc jockey David Shane Whitby, 56, was found guilty of 120 offences against eight children, the youngest 14 months old.

In sentencing him, District Court Judge Peter Berman described Whitby's offences as worse than that of paedophile Robert 'Dolly' Dunn.

"There are people like Mr Whitby in the world, and it is necessary to describe the evil that people do because, as Shakespeare reminds us, 'that evil lives after them'," the Judge said.

Whitby assaulted his victims over a 10-year period, photographing and filming the acts.

The court heard he abused his victims while wearing bizarre outfits such as female clothing, masks and wigs.

The Judge said of one of the videos, "I have never seen one human being treat another in such a vile, disgusting and perverted manner".

"The core of his wrongdoing is that he has caused harm to children.

"He gave no thought to the welfare of any of the children he abused."

Judge Berman said Whitby has shown no remorse and is proud of his offences.

He said Whitby "believed he would never have to face this day".

The Judge described the offender as a "committed paedophile" who was in a position of trust by the children parents.

The court heard he manipulated one of his victims, a boy he molested from the ages of eight to 13 by offering him money, alcohol and drugs.

Family members of some of the victims ran from the court crying as details of some if the crimes were read out.

Outside court, one of Whitby's victims read a statement.

"I speak for other victims, as well as for myself, when I say no jail sentence will ever take away the pain, trauma and suffering we all have and will continue to endure," she said.

"Justice may have been served but the memories and the nightmares never fade.

"All we can do now is to try and piece together our lives and find comfort knowing that he will never be able to hurt another innocent child."

Whitby sat in the dock in prison greens with his head in his hands while he was being sentenced, at times shaking his head.

He was given a maximum sentence of 32 years and will be eligible for parole 2034.