A primary school teacher who secretly filmed his pupils getting undressed was caught when police investigated his paedophile father.
Detectives unwittingly discovered the webcam videos of Gary Ellins, 45, as they searched the Stockport home of his father, Jerry, last November.
They seized pen drives and computer hard drives belonging to Gary Ellins which contained two videos of children in states of undress, some as young as eight, together with generic images of naked, pre-pubescent girls.
Ellins made no comment when he was arrested but pleaded guilty last month to offences of voyeurism and possessing indecent images of children.
On Thursday, he was jailed at Manchester Crown Court for 12 months after a judge said he had committed a "breathtaking breach of trust".
Ellins's father has also admitted separate offences involving indecent images of children and will be sentenced later this month, the court heard.
Ellins junior, formerly of Vernon Drive, Marple, only qualified as a teacher eight years ago after a career in commerce and property.
He committed the voyeurism offences between 2010 and 2012 while working in his first teaching post at Micklehurst All Saints CE Primary School in Mossley, Tameside.
Ellins installed a static camera via a laptop webcam to capture two classes who were getting changed for PE lessons.
Sentencing, Judge Martin Rudland told him: "The images clearly show you in a calculated way setting the camera up and leaving the room while the children in your care quite innocently and happily were allowed to change to prepare for gym class.
"So it was for your own personal sexual gratification you were able to obtain images in that way in a complete and breathtaking breach of trust placed in you, not only by the parents of those children but also your employers."
Michelle Brown, defending, said her client had shown insight into the damage caused and has recognised he is someone who requires treatment and assistance.
Ellins received eight-month jail terms, to run concurrently, for two counts of voyeurism, and an additonal four months in prison for six counts of possessing Catergory C indecent images of children.
He must sign on the Sex Offenders Register for 10 years.
Ellins left the Mossley school in August 2012 and more recently lectured at Manchester Metropolitan University where he quit early this year after being suspended when the allegations came to light.
Following sentencing, Detective Inspector Mike Gladwin of Greater Manchester Police's Sexual Crime Unit, said: "Ellins used his position of trust to exploit those whom he should have been protecting.
"The safeguarding of children is a priority for GMP and we have worked, and will continue to work, closely with our partners in education and local authority to ensure their safety.
"Ellins' victims, their parents and his former colleagues who have been affected by his crimes are being supported by specially trained officers and the local authority."