Grenache
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While I think many lenses can render and many scenes can support a 3D look, it is neither a straight up property of a lens that all shots will be 3D in appearance nor is it possible to get every scene to look that way.
From what I have seen, there are several factors that can help enhance a 3D look (most mentioned already). More than one of the items must come together to make it work, but you can get varying degrees of 3D in the absence of the full list...
Sharp focus
Shallow DOF
Side lighting
Color or tonal separation of subject and background
Sharp gradient of focus (not necessarily same as shallow DOF)
Environmental cues (lines enhancing perspective)
Simple shallow DOF is not sufficient, if it were then all macro shots would look 3D when in fact very few ever do. The following closeup shot though snags some light, focus gradient and color to pop a few of the buds and stamen into a 3D look. Notice how even different parts of the flower in the same focal plane vary in apparent 3D-ness depending on what is behind them in terms of color and light.
In the second example, one could argue that there is very little difference in focus or even that it does not particularly have shallow DOF, but the boy is still coming out of the image some.
In the can example, clearly not attractive, both the can and weeds appear more 3D, but for different reasons. The weeds are a cheat with shallow DOF and light alone. The can exploits the angle and lighting while mostly being in focus.
At least that is how my eyes see these. Others will certainly differ.
Jim
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