Format A

21 x 28 image size

27 x 36 image size

36 x 48 image size

52 x 70 image size

Format B

20 x 40 image size

25 x 50 image size

30 x 60 image size

Format C

31h x 30w

41h x 40w

58h x 57w

Format D

24 x 36

26.5 x 40

30 x 45

All sizes are editions of five.