crop-mode preview aspect ratio incorrect
Created originally on Bitbucket by dpjpandone (Johanan Pandone)
On EOSM the aspect ratio preview is incorrect in crop mode, the preview shows more on the top and bottom than what's actually recorded, I think this might be due to the fact that the code thinks the width of the full frame is 1728, when it is in fact 1792 in crop mode on EOSM.