What is the most suitable aspect ratio of banners for scenery photos?

1, 2.5X3 inches-commonly known as 3 inches, also known as "palm treasure" or "wallet photo";

2, 3.5X5 inches -3r, commonly known as 5 inches;

3, 4X6 inches -4r, commonly known as 6 inches.

4, 5X7 inches -5r, commonly called 7 inches;

5, 6X8 inches -6r, generally 8 inches;

6. 7X 10 inch -7R, generally 10 inch;

7.8X 10 inch-this is the size of 20X25 that is often required in film competitions;

8. 10X 12 inch-also a common size;

9. 1 1X 14 inch-mostly the photo album size of a photo studio;

6:4 frame -35mm format (also called 3:2)

Therefore, the default ratio of 35mm film is that of most Nikon/Canon Quan Huafu and aps-c cameras. The width of the picture is obviously longer than the height, so the reader will subconsciously look at the picture from left to right, and the diagonal guide line will be quite appropriate here.