#SWIRLING BOKEH LENS SERIAL#Coverage: Full frame Serial No.: 83135801 Mount: M42 Tiny. I suspect it was the situation (smaller aperture, softer-toned backgrounds) that avoided the effect being noticable, not an actual difference in the lenses. Helios 44-2 58mm f2 swirly bokeh vintage prime lens adapt to Canon-EF or Sony or Fuji. I'd be interested in seeing some examples from your earlier 50 APO, which you say did not do this (at some point - no rush!). Luckily the lens barrel is skinny and will slide inside the camera mount, somewhere like a C-mount lens. Adapting/refitting that lens is not easy since to get infinity the rear will sit closer than the camera mount. It is just a function of squeezing a 50mm f/2 lens into an E39-diameter lens barrel. The most swirl I have achieved out of any lens it's the tiny projection lens for 16mm film a Bell&Howell 50mm f1.6. Therefore whether a lens is APO or ASPH or not is mostly irrelevant. It is just a physical cropping of the aperture. It is not a lens "aberration" (the glass misdirecting light, as with CA, or coma or astigmatism). Pinpoint lights, a dense pattern of leaves or branches silhouetted against bright sky, etc. However, it won't show up in every situation - it requires subject matter that in structure and brightness/contrast, produces strongly differentiated blur circles. Allowing this new lens to satisfy photographers. which is the primary cause of "swirling bokeh." All those "lined-up-in-a-circle" blurs can end up looking like circular motion blur. The Lomography X Zenit New Petzval 85mm mimics the first Petzval lens to come out of Vienna, Austria in 1840. at the top and bottom they are horizontal, and on the sides they are vertical, and in the corners they change angles in a curve from vertical to horizontal). And because the lens produces a circular radially-symmetrical image, the cat's-eye blurs also line up tangentially around the center of the image (i.e. So if a lens has OV, the blur circles around the edge take on the same cat's-eye shape as the aperture seen from that angle. the blurs that make the bokeh) take on the shape of the aperture as it appears from the image plane. (Note - BTW - that optical vignetting is vignetting - it makes the picture edges and corners darker because the aperture is effectively smaller and passing less light when cut off by the lens barrel). At, say, f/5.6 or smaller - which is likely about the aperture mmradman used for his picture above. Stopped down, of course, the aperture becomes small enough to avoid being cut off by the barrel, so we get a symmetrical, uncropped aperture, and even bokeh across the whole image. And the APO-Summicron, like most fast Leica M lenses, does this also (note cat's-eye aperture when seen off-center). Optical vignetting (OV) effect.Īny lens that 1) has a large aperture value (f/2.0+) and 2) is not infinitely thin front to back, will get vignetting due to the fact that it is a long "tunnel" - the lens barrel itself crops the round aperture to a cat's-eye shape. I can't imagine the APO-Summicron-M not doing that - in at least some situations.
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