A teacher who admitted making upskirt videos has abandoned a bid to keep his name secret.

Douglas Martin, Lincoln High School's former assistant principal, was arrested in November and later admitted making 20 secret intimate recordings involving 17 victims using a small hand-held recorder.

The deadline for filing the 57-year-old's appeal to the High Court expired this morning. Some suppressions continue to apply in the case.

The school issued a statement this morning, with the principal, Linda Tame, saying she was outraged and angry about Martin's behaviour.

"It's an immense breach of trust," Tame said.

"He was a respected and trusted member of staff so this will clearly have a significant impact on our students, the school and the wider Lincoln community.

"Support for Lincoln High School students, and the school's community and staff are the most important things right now."

Martin has been suspended from his job since his arrest and has not been permitted on the school grounds. The board of trustees accepted his resignation, with immediate effect, on January 24.

The school had put in place a number of welfare initiatives for anyone who needed support. All parents had been notified.

Tame said the school was shocked to hear of the allegations and subsequent arrest, and co-operated fully with police.

The school had notified the Ministry of Education and followed legal advice.

Martin's offending was committed in Christchurch and surrounding areas from June 15 to November 17.

Martin is on bail and is due for sentence on April 18. Police checked his computer system after he was first arrested for making one recording, and then laid the 20 charges.

New Zealand Teachers Council director Peter Lind said the matter had been referred to a complaints assessment committee, and Martin would go before a Teacher's Council disciplinary tribunal this month.

Any case where serious misconduct of a sexual nature was proved usually resulted in a teacher being struck off the register, he said.

Lind said this was a rare, but ''serious case''.

''We have over 100,000 teachers in New Zealand currently, and we get mandatory complaints for less than 0.01 per cent. There are very few.''

- © Fairfax NZ News