First introduced in 1972, Kodak’s “Pocket Instamatic” 110 film cameras proved remarkably popular. First to arrive, in 1976, was the Minolta 110 Zoom SLR, with its distinctive, horizontal design and a fixed 25-50mm f/4.5 zoom lens. Though compact, it was still somewhat larger than the Asahi Pentax 110 Auto that would come almost two years later. Advertisement for Pentax 110 camera system in Practical Photography magazine, June 1981 (Image credit: Alamy)The 110 Auto proved to be the smallest interchangeable lens SLR camera ever made – for any format, by anybody. I had the opportunity to play with a Pentax 110 Auto for some weeks, while I sold it for a friend.