Several of the types of holders made for large format film, including darkslide sheet holders, Grafmatic multi-sheet holders, the Graflex bag mag, and film packs were also manufactured in medium format sizes, almost always 2"×3" (6×9 cm). Press camera manufacturers often produced smaller versions of their 4×5 cameras in this size, often called "23", and while later versions of these cameras could use rollfilm adaptors, these were not widely available until almost 1950, and were expensive in their first years of production.