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Message: <blockquote data-quote="mikenott" data-source="post: 3165826" data-attributes="member: 71182">Roger P - a good question. The cropping does NOT result in a magnified image in the viewfinder (it may well do when electronic viewfinders become the norm) but instead the 1.3/1.6 cropping is represented in the viewfinder by boxes/lines/dots. Its main purpose is to reduce file size being fed to the storage medium and so improve(?) delays due to memory catching up with the camera and/or filling memory cards too quickly (a 50megapixel RAW + JPEG file can be a beast in terms of file size (50-60 MB?) . The net result is, as you say, a saved image very similar to what you would see when cropping a full frame image from teh same camera in Photoshop or similar. Of course, Canon may have a surprise up their sleeve but as the 5DS R is based on the 5DIII and even the no  AA is a compromise by having a second AA filter to negate the effect of the first AA filter, I don't think there will be any new clever optical tweaks.The interesting point (that will only be proven when real world images are seen) is what a 1.6 crop image from the 5DIII looks like compared to an image from other bodies such as the 7DII and the 1Dx which moves into areas of pixel densities and sensor sizes that are beyond my skills!</blockquote>