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Message: <blockquote data-quote="elkcub" data-source="post: 3284530" data-attributes="member: 14473">Hi Henry,I've attached a screen shot from an early part of the video to give you some idea of what it's about.  The scene from a 21mm Leica lens is shown on the left and an older 21mm Cooke lens on the right.  The narrator discusses the difference in terms of visible distortions, and whether or not modern lens corrections are beneficial in so far a three dimensional realism is concerned.  To me the effect is quite striking, and corresponds with what I've been thinking about the shortcoming of flat-field lenses.  In motion, the 3D effect is even more evident.  There is no discussion of the optical differences between the two lenses, and so any number of design factors could be producing the effect, but I believe the Leica uses a flattener to correct field curvature.  It also looks like rectilinear distortion is highly corrected.  If that's the case, then it's hard to separate the two influences.  As Tobias pointed out, and perhaps should be emphasized, the visual cues are all 2D, so the 3D perceptual effect is independent of stereopsis.  Ed</blockquote>