Sheffe, of The Worthys in Bradley Stoke, pleaded guilty to six charges of making indecent photos of children and a charge of possessing extreme pornography.
He also admitted four charges of taking indecent images and two counts of voyeurism.
Judge Martin Picton jailed him for three years and ten months.
He told Sheffe: “The creation of such images, and their knowledge you did that for your own sexual gratification is, frankly, a crime of breath-taking cruelty.
“The victim impact statements demonstrate the enormous harm that you have done and your actions beggar belief.”
The judge ordered that Sheffe’s computer equipment be destroyed and imposed an indefinite sexual harm prevention order restricting his access to children under 18 and to the internet.
Sheffe was barred from working with children and vulnerable adults and told to register as a sex offender indefinitely.
Julian Howells, prosecuting, said Sheffe rigged up spy cams to recorded private footage of a teenager, including sexual activity.
Police who had cause to search Sheffe’s computer equipment also found voyeuristic material of the girl on his mobile phone and more such material on a video camera, the court heard.