Today I imported RAW images I shot on the Canon 5D mk3. For a couple of these images I had the camera set to "Add Cropping Information" set to 1:1 ratio. Crop lines are displayed on the camera LCD but you see the full frame outside of the crop when you review the images. To my disappointment, when I imported them into ACR the images appeared cropped to 1:1. I assumed there would be a setting in ACR somewhere where I could turn this aspect ratio info off and apply it later in PS if I still wished (I only used the in camera setting as a guide). Unfortunately it can not be removed. I immediately started to research this and found that this is an intended behaviour and if I wish to uncrop the image I would have to use Canon's own Digital Photo Professional software. Sure enough, the images were intact when viewed there. I can also see the complete file when viewed in MAC preview but as soon as I opened it in any of Adobe's software the crop re-appeared.
How can this be intended behaviour? It's destructive editing! Doesn't it go against the principle of working in RAW? Why make anything that can't be undone? The camera is sending all of the information and Canon's software, Digital Photo Professional, gives you the entire file. Obviously this is the intention of the camera manufacturers.
I think Adobe should re-evaluate it's position on this and give the user the option. Otherwise the feature on the camera is not usable. Upon further research I found this is not just a problem with the Canon 5D mk3 but with many other digital cameras that have the aspect ratio option in its menu. Apparently, Adobe have now started including the option to ignore this crop tag in the exif from the very latest model cameras but have no intention of making it available for previous models...
Adobe! Up to now I've loved your software, please don't make me start disliking you!
Good job I liked the crop because thanks to Adobe it's there to stay!
Some of the above blog information was copied from other sites!