Originally Posted by Eddie
Hi Eddie. Ahh, the elusive swirly bokeh. Impossible to define and more impossible to formulize. It seems to happen only in the portion of a petzval lenses image circles that were never intended to be "in the image" in the first place. So the only way to get it on purpose is to get a petzval type lens that just vignettes the corners on the format in use. Roughly this might be 4-6 inches on a 4X5 and 10-12 inches on an 8X10. The larger the aperture the better too. You would pick the shorter of the lenses for nearer subjects as the bellows goes out. So at 6 feet from the lens a 10" petzval would give nice swirley bokeh on the 8X10 camera. Then your composition needs to have elements that will show the swirling, like bushes and tree branches. The busier the better. It's hard to portray a swirley blank sky. Wollensak Verito's have the same properties in the same conditions. Rapid Rectilinears mostly do not. So just because a lens is old means very little. The Goldfield Courthouse series I posted was all done with lenses that are 90 to 110 years old and the photos are tack sharp. Hope this helps some. Best, Jim
Note: This is from a private e-mail but there is a lot of general interest so I thought to bring the discussion here. Hope Eddie doesn't mind too much. More to learn from others in any case. jg
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