How on Earth would someone use a flat chart to test the behaviour of threedimensional effects? And how related is the distance to the bokeh? So, you test a various distances with various apertures? And what do you do with the rest of the year? I amgine this a very time-consuming procedure.
The way I see bokeh is aperture related to distance difference of the main subject to highlights. Also, highlights is one think, bokeh and the behaviour with light to dark contrast another.
Specular highlights don't really have 3D-properties. This test just makes clear how mechanical vignetting affects bokeh "ball" shapes ("cats eye", mirrorbox mechanical vignetting even), and that can also give a clue to the tendency of a lens to cause "swirly bokeh".
(10-26-2018, 11:05 AM)Brightcolours Wrote: Specular highlights don't really have 3D-properties. This test just makes clear how mechanical vignetting affects bokeh "ball" shapes ("cats eye", mirrorbox mechanical vignetting even), and that can also give a clue to the tendency of a lens to cause "swirly bokeh".
I think it makes a difference wether a highlight is close or far in relation to the focal pane, in size and in gradient. That's what I meant with 3d situation.
(10-26-2018, 11:05 AM)Brightcolours Wrote: Specular highlights don't really have 3D-properties. This test just makes clear how mechanical vignetting affects bokeh "ball" shapes ("cats eye", mirrorbox mechanical vignetting even), and that can also give a clue to the tendency of a lens to cause "swirly bokeh".
I think it makes a difference wether a highlight is close or far in relation to the focal pane, in size and in gradient. That's what I meant with 3d situation.
That is true for every bokeh related thing, for sure. And for sharpness measurements, LoCA, astigmatism, coma, and so on. And most probably also for vignetting. And LaCA.
(10-27-2018, 09:18 PM)Klaus Wrote: For those lenses where bokeh matters the test distance will not be an issue.
I think you may be wrong here. Test distance does matter for bokeh balls / highlights, even more so in relation to FL, and whether they are in the foreground and background also matters.
I am assuming that the old bokeh test will still be used too?
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....
