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 p.1 #14 · which lens has the least 3D POP? | |
philip_pj wrote:
The really interesting and central piece of the puzzle is that we are really talking about two competing and very different 3D models of imagery, and the great extent to which all lens producers pay lip service to 3D:
1. the two-layered Zeiss 3D model with super sharp generally centrally located subject(s), followed by a rapid longitudinal fall-off of focus (DOF) into a super smooth and highly abstracted bokeh field with little or not identifiable image motifs in the background. The aim is to draw the viewer’s attention to ‘what matters’ (their words) being the sharp subject, while relegating the rest of the image field to unavoidable material that is best blurred out, because it does not matter.
2. True 3D is of course the exact opposite of this Zeiss 3D model – everything in the image matters and it should be portrayed as you see the scene in real life, as translated by the lens's character. Objects in image space should appear at the right distance relative to each other, the degree of focus fade should correlate with distance from the lens, focus fade should be gradual both longitudinally and from center to corners.
The level of abstraction should be commensurate with distance also. The bokeh field can then come alive with vitality and context – we see where the subject was in their environment, we can linger long, looking at the whole image. Faces look like we see them in everyday life, not like some lunar landscapes.
To fool people successfully, it’s very important to control the flow of information, to position yourself as the authority on the issue. That is exactly what the people selling you the Zeiss 3D model of image reality have done.
It is much easier in design to develop lenses that simply produce massive blur fields than it is to provide content-rich and well-structured focus fade and identifiable out-of-focus content. The CAD routines can do all that.
It’s been a long-term project of theirs, spanning the pre-internet age and the modern information-rich world. It makes good business sense too. The fast lenses that they promote most of all are the ones that perform best within their 3D model.
They are also very lucrative, due to their high unit prices and the fat profit margins they deliver. Remember, lenses sell in the millions. These are the reasons ever-faster mainstream lenses are appearing, f2 zooms and the like.
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