"I would feel weak and powerless."
Katterns also made 22 videos of the girl's younger twin sisters and when police seized his computer, they found 10,000 other objectionable images.
In April, he pleaded guilty to three charges relating to the inappropriate sexual behaviour, two charges of making an objectionable publication and one charge of possession of 10,000 objectionable images.
At sentencing today, Judge David McNaughton said he took into account Katterns' remorse for the offending and that he was unlikely to offend again.
He read a psychologists' report in which Katterns said he felt disgust at his actions and relief that the offending had been discovered and that he was responding well to therapy.
However, a mitigating factor was that the offending took place over so many years.
McNaughton sentenced Katterns to two years and three months in prison concurrently.