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That may be so but it's easy to get good OOF rendering of mids and shadows. Highlights and especially specular points require great bokeh to look pleasing. I think that is where the "quality" comes in.Agree with JC on this one.
Bokeh does not have to include specular highlights, although it could.
Bokeh is "quality" of OOF area. Amount of oof can be measured based on focal lenth, aperture and focusing distance, but bokeh (as quality of oof) cannot be measured.
True. A bright pinpoint of light against a deep black background is just about the most difficult test for any optic, just ask any astronomer. I can imagine using an artifical star (for example http://www.telescopes.com/telescope-accessories/collimation-tools/astrozapartificialstarforcollimation.cfm ), focus the lens on it , then move back half a meter and make a test shot, another half a meter and another test shot, and so on. That would clearly show how a lens handles such highlights at various distances behind the focal plane.Judging bokeh without spectural highlighs tells much less about a lens than judging with it.