![]() ![]() If have seen some old Zeiss Lenses there Produces similar swirls Results. I haven't pulled apart a Primoplan to check, but from a Google search the Primoplan appears to be a Cooke Triplet derivative, not a Double Gauss. If You really like swirl Circular Background DOF/Bokeh, You should Test the 50mm F/1.8G Nikon. Some of the other older lenses, like the Schneider and the Speed Panchro, exhibit the cat's eye highlights, but don't seem as swirly as the Meyer. Other lenses tend to blur in different ways. In the Alexa stills part of my blog post (the shots of a Bolex against a window) the Meyer Primoplan lens (from the 30s) shows the most obvious swirly bokeh, and you can see from the de-focussed projection image of that lens that the tangential lines are less blurred than the radial ones. This correction is intimately linked with field curvature. Bokeh is defined as the effect of a soft out-of-focus background that you get when shooting a. These are normally somewhat corrected to meet in the plane (or curvature) of focus but depending on the design the out-of-focus areas may be much less blurred in the tangential direction, leading to a sense of circular motion. This lens design was one of the first portrait lenses and is. ![]() But mainly I think it's an astigmatic effect, where radial and tangential lines focus at different planes. Allowing this new lens to satisfy photographers. After looking at several of them I found one in excellent condition and ordered it for less than 50 including shipping. I did a quick search on Ebay and quickly found a ton of these for sale out of Russia and the Ukraine. I think it's probably partly due to iris vignetting, which causes cat's eye shaped highlights that create the sense of ovals circling around the image centre. The Lomography X Zenit New Petzval 85mm mimics the first Petzval lens to come out of Vienna, Austria in 1840. Out of the several models of these lenses, the Helios 44-2 model lens reportedly creates the swirly bokeh I was looking for. Then again, you don't find it in modern Double Gauss derivatives like Zeiss Planars, which are used in many Zeiss cine lenses. I don't think the effect is limited to or caused by a particular lens family like Double Gauss, I'm pretty sure some C mount triplets had it too, but maybe the Double Gauss line is easily susceptible. Over 20 people looked at this in the last 24. There's a lot of internet conjecture about the causes of swirling bokeh, I can't say I have a definitive answer either, but the images in my post are interesting to study. PETZVAL Swirly Bokeh - Modified Lens from MC HELIOS-44M-4 +Sony Canon Micro 4/3 Nikon Fujifilm. ![]() Albion, you might be interested in a blog post I wrote comparing various cine lenses from the 20s to modern times, specifically looking at the out-of-focus characteristics: ![]()
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