Sheet film
![Holder with a sheet of color film (for demonstration only—ambient light would ruin film)Developed Ilford FP4 13x18 Negative](/Images/godic/202502/10/Chassis_ouvert0549.jpg")
![Ilford FP4 13x18 Negative](/Images/godic/202502/10/13x18_نگاتيو_ايلفورد_0020549.jpg")
Sheet film is large format and medium format photographic film supplied on individual sheets of acetate or polyester film base rather than rolls. Sheet film was initially supplied as an alternative to glass plates. The most popular size measures 4×5 inches; smaller and larger sizes including the gigantic 20×24 inches have been made and many are still available today.