![]() ![]() I think the Petzvals produce this effect because of the nature of the barrel lens, which obstructs light when you require a wide coverage. I want something like the Petzval lenses - see here - whereas if you look at my shots, the swirliness is mild compared to the Petzval (the Petzval has that level of swirl near the middle of the image, and much more at he edge). And it didn't produce a lot of swirl, so maybe I need to make a smaller circle to produce more vignetting and swirl effect. It was of course a sloppy circle, so the bokeh patterns, even in the middle, are imperfect circles. This seems to "obstruct" light entering obliquely, causing a circular cats eye bokeh pattern (swirly bokeh). Hence, there is physical vignetting on the rear element of the lens. The hole in the circle is smaller than the rear element. I cut out a circle, and cut a hole in it, and taped this to my rear element. (this is important, as the adapter puts a little space between the rear element and the E-3 body, so I can tape on the hole. The Rokkor is connected to the E-3 via an adapter. To get the swirly effect seen in the shots below, I used a Minolta Rokkor-X 50/1.4 with my Olympus E-3. It is just caused by physical vignetting of the rear element this causes oblique light bokeh patterns (closer to the edge) to have a cats eye effect: Thanks to various posts by people in these forums and elsewhere online, I think I've figured out a way to get swirly bokeh patterns on any lens. ![]() Swirly Bokeh Modification of a Lens: Pictures ()
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