Here are three different images, taken with three different lenses. They are all 50mm lenses, all images are taken wide open. What you are looking at are distant street lamps with the lens focused pretty close, not MFD but to a short distance.
In the top image we can see a bright ring around the distant "spots" but not a ring completely surrounding the blobs but partially only. Is there a name for this phenomena? I seem to recall somebody once called it crescent type of bokeh but maybe there is a better name for it? And why is it there? ny insight or comments are welcome! Images:
In the center image there is a tendency and the third image is from a lens not making this ugly thing. (The second lens works fine for real life use, the first one is not so nice.)
regards,
/Jonas
In the top image we can see a bright ring around the distant "spots" but not a ring completely surrounding the blobs but partially only. Is there a name for this phenomena? I seem to recall somebody once called it crescent type of bokeh but maybe there is a better name for it? And why is it there? ny insight or comments are welcome! Images:
In the center image there is a tendency and the third image is from a lens not making this ugly thing. (The second lens works fine for real life use, the first one is not so nice.)
regards,
/Jonas