That 3D look

is there a 'recognized' lens or formula that consistently produces a 3d affect?

Not the lens, Joe, unless it's a lemon.

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I think I'm right in saying these two exhibit the 3d effect:

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Both Leica M6 with the Voigtländer Nokton Classic 35mm f/1.4 SC.
 
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The CZJ 5cm 1.5 with Kodak 100UC. Some people said that they saw a 3D effect here.

Maybe this one too (same lens)?

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How about this image (Canon 19mm)?

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Medium format does it consistantly ... particularly the 105mm f2.4 on my Pentax 67.


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I find this quite interesting, this "3d pop" thing seems to be very subjective. To me it isn't very much about bokeh in itself. I saw some pretty extreme examples from the 35 f/1.4 distagon on Flickr a while back (i think it was). It looks to me as it happens mainly with Zeiss lenses, and that bigger format helps. I think that might be because because bigger format == shorter DOF at longer distances.

The two shots below, in my opinion, really shows that effect.


img152 by chrishayton, on Flickr


Louve by chrishayton, on Flickr

Both with the most '3d' effect camera and lens I have come across, Pentax 67 and 105 2.4
 
i think the thing that might give a good 3d effect is a lens that blurs the background to around the same degree that the human eye does.

unlike a super telephoto lens that completely blurs everything behind the focus plane a good "3d lens" leaves things behind the focus plane relatively recognizable but blurred enough to see it's definitely not in focus.
 
I picked up an old Helios 44M a week or two back, and while I already had another 44M-4 which I found to be unremarkable, this one definitely has a distinctive crisp focus delineation or whatever it is that adds a 3D sparkle. Weird though, it also has bad edge blur that makes it almost a trick lens.
An annoying and persistent problem I have showing it is it gets lost in the file upload somehow. The images lose contrast and sharpness.

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