Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 423)

Processing Images with Specified Aspect Ratios
JPEG or HEIF images at the specified aspect ratio are created when you process RAW
images shot with [
: Cropping/aspect ratio ] ( ) set to [ 1:1 (aspect ratio) ], [ 4:3
(aspect ratio) ], or [ 16:9 (aspect ratio) ].
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