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Hmmm... must be an individual difference in perceptions. I personally found that my longer lenses (e.g., the 135/1.8 I mentioned) give me more of a 3D look than my wide-angles. The subject seems to almost come out of the screen. I'm not talking about the subject's nose being in more/less focus than the eyes. But even different parts of the face can be differentially focused with a 100mm lens... no limitation by the laws of physics (and no distortion). E,g,.Nice isolation and good rendering, but as flat as a board.
The laws of physics don't help at 100mm.
3D is a big ask over 24mm or so.
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Ron.
Volunteer, what could possibly go wrong ?

i think that we are distracted by the lovely model ;-)Somehow, the more identifiable but smooth background combined with a very sharp subject gives a nice realistic 3D effect. At least to my eyes... Perhaps it's the focal length too. I get the best such effect with my SAL135mmZ at some distance from the subject.
Nice isolation and good rendering, but as flat as a board.
The laws of physics don't help at 100mm.
3D is a big ask over 24mm or so.
just recently, and there's enough debate there to proveHmmm... must be an individual difference in perceptions. I personally found that my longer lenses (e.g., the 135/1.8 I mentioned) give me more of a 3D look than my wide-angles. The subject seems to almost come out of the screen. I'm not talking about the subject's nose being in more/less focus than the eyes. But even different parts of the face can be differentially focused with a 100mm lens... no limitation by the laws of physics (and no distortion).
Nice isolation and good rendering, but as flat as a board.
The laws of physics don't help at 100mm.
3D is a big ask over 24mm or so.
To me, 3D effect and subject isolation are different things, as I described earlier. 3D effect implies a succession of different planes to provide depth. Subject isolation can be part of the 3D effect, but is not enough.Yes, there is clearly some difference of opinion here. And I was careful in my OP to state that the there was a 3D effect "to my eyes at least". I know we're into subjective territory here...
But here is a webpage that shows the same effect with the contributing factors (lens, technique, settings, etc.) explained. I find the examples to have a strong 3D appearance... again, the subject seems to pop out of the background. The author also suggests that this works best with longer FL lenses. Anyway, this is the sort of thing I was talking about....
http://neilvn.com/tangents/making-your-images-pop-through-lens-choice/
Very smooth back ground rendering, I don't see any " 3D" though.Somehow, the more identifiable but smooth background combined with a very sharp subject gives a nice realistic 3D effect. At least to my eyes... Perhaps it's the focal length too. I get the best such effect with my SAL135mmZ at some distance from the subject.
The perception for me is strongest in the first image, but you didn't include it here for some reason. Perhaps you see in that one. I also see it to a lesser extent in the last one (the second one you included here). Again, it's the result of a detailed subject with good micro contrast in front of a smoothly blurred but recognisable (or not abstracted) background. To me, the model seems to come out of the screen. At least, that's how it appears to me. You have to view at 'original size', btwWhere is the 3D pop exactly? DOF and bokeh looks the same to me as any other telephoto lens.