The types of film or sensor sizes

ULF - Ultra Large Format

Sensor or film size larger than large format, bigger than 11x14.

Large Format

Film or sensor size from around 4x5 inches to 11x14 inches.The LargeSense cameras LS911 and LS45 are large format digital cameras.

Medium Format

Any size between small format and large format. Full frame medium format would be at least 645 size.

Small Format

35mm film or 24x36mm digital sensors. Smaller than that would be cropped small format.