Michael Ambrose Endicott, 75, was convicted of three counts of indecently dealing with a child in the 1970s and 1980s after a five-day trial in Brisbane District Court.

But the jury acquitted him of five other counts of the same charge.

Endicott's trial was told he was in charge of pastoral care and religious education at Villanova College during the 1970s.

The victim said he was first abused by him on a school hiking trip in 1975.

Endicott asked the boy to accompany him alone to a secluded area along a creek to collect water, where he photographed the nine-year-old student naked in a variety of poses.

Three years later, when the boy was 12, Endicott abused him again after asking for help with something in the school tower.

Again, the boy was photographed naked.

Years later, when the boy was a teenager, Endicott took him into a change room and told him to strip when photos were taken of him in the shower.

The trial has also heard from other former Villanova students, with at least two claiming he took nude or semi-nude photos of them.

Endicott was released on bail and will be sentenced on Monday.

Australian Associated Press