My hunch is that it is one or two factors, maybe together: placement of the light, and a cheap filter. I have taken many thousands of photos with good UV filters, with several cameras and all sorts of lenses, and have never observed this phenomenon. anti-filter argument, which has already started. Hopefully these images might help someone else struggling with the same issue. However, I do have a few shots that have displayed "odd" bokeh and I wonder if it might not be a similar effect. This is not an effect that I've seen before, although I think it is probably tied in with cheaper filters (I use canon and Hoya HMC Pro filters, my colleague use(d) Jessops and Kenko filters). The effect, and solution, were identical on his 55-250 lens also. Turning the filter a bit changed it to vertical: Here's an example of how the bokeh looked (this is one of the test shots from our final diagnosis of the problem):Īs you can see, the bokeh shows strange diagonal lines, but the focused subject remains free of any camera shake problem. The direction seemed consistent (and after a while far too consistent for camera shake). To begin with it seemed like camera shake, and was much more prevalent at the long end of the lens (in both cases). On both the 55-250 and the 150-500 we've seen a strange effect of diagonal lines in the bokeh. He wanted more reach without paying canon prices, and bought a Sigma 150-500 OS. My colleague got into photography recently and bought a 450D, 18-55 and 55-250. I have mentioned this previously on a thread in this forum, but now I have some (not very) pretty pictures to go with some words.
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