Hi, long time lurker here. I thought I'd finally jump in with my own imput because of a question that's been nagging me for a while.
It comes from reading lots of lens reviews here. I've seen quite a lot of lenses praised as having a "3-D" look. Before, I thought it was just a function of focal length. Telephotos, by their nature, flatten the depth of a photo. Wide angles, on the other hand, exaggerate the depth of a scene, making it look "3-D."
I've heard people say the Sigma 30 f/1.4 looks "3-D", and I have to agree, even though it's a normal perspective on APS-C. It was part of the reason I bought it, despite the mixed reviews. The picture I've attached was taken with that lens (could someone tell me how to upload a picture and put it mid-text??). It looks like her front paw is coming right out of the frame!
Then, I see someone praising the FA 77 Ltd. as having a "3-D" look, and I'm left scratching my head. On APS-C, the FA 77 is well into telephoto territory. Looking at the samples, I don't see any "3-D" effect at all. Is there something more to it, or was that reviewer just full of it?