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Message: <blockquote data-quote="elkcub" data-source="post: 1744104" data-attributes="member: 14473">Well, acuity is measured monocularly and there is no 'stereo experience' under that condition.  Given equal magnification and FOV, images will appear to be the same size, and depth perception (i.e., relative distances) will be determined only by monocular cues, e.g., perspective, shading, relative object sizes, etc.Being somewhat anal myself, the apparent size difference between a roof and a Porro isn't really an illusion in the true sense, which occurs when things appear to be different from what we know them to be.  For example, the globe effect is an illusion because there isn't any globe.  In this case things just appear different, rather than being correct or incorrect, and the question is "why?".In the curious case of the 10x Nikon and Canon, I would think that the first question to ask is whether they have the same objective separation.  If they do, you may have selected a great dissertation topic.  :t:Ed</blockquote>