A series of images obtained with large format cameras.
"Large" is anything that goes beyond the medium format, which uses a film of 6 cm wide (the "classic" 35mm format uses a film of only 24mm in wide!).
I usually shot in the American size 4 "x 5" (about 10x12cm), cause I like the squarish ratio, 9x12cm (European version of the american 4x5 , intercheangeable by using the right holder in modern 4x5 or 9x12 cameras) , 13x18cm, 5 "x7" using self-built or antique machines.