- Aspect ratio is the ratio of width to height of an image, print, or video. Examples: 1:1 is a square aspect ratio, because an image of 1x1, 2x2, 10x10 and so on are all square images. Micro four-thirds cameras' native aspect ratio is 4:3. DSLRs output 2:3 images (hence the ubiquitous nature of the 4x6 print, dating back to 35mm film, which also took 2x3 images by default.) We can of course crop to any output of our choosing. Popular choices include 8x10 and 11x14. In the video realm, 16:9 is the current default for HD video.
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