Olaf, I wouldn't read too much into the iris-shaped highlights in the
spiderweb photo, particularly the white highlights. Very few lenses can do
better when shooting into leaves against a bright sky. It also depends on
aperture and distance between the subject in focus and the out-of-focus
background.
I'd bet if we experimented with all of our lenses shooting into a leafy tree
or similar background (deliberately left out of focus) using various
apertures, we'd find that each lens produced this iris-shaped highlight at
some point. Even my Lentar 135mm f/3.5 preset with its nearly circular
aperture will produce circular-shaped highlights in this shooting situation.
Leafy backgrounds may be among the trickiest in all of color photography.
Take a look at this image, taken against a similar background using a Tamron
zoom at the 200mm setting.
http://www.photoscene.com/lexjenkins/emulaf2.jpg
This was the best of the lot, with the least distracting bokeh. But white
and green aperture-flare highlights are visible throughout from the bright
sky and reflections off the leaves.
---
Lex
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From: "Olaf Greve" <ogreve@xxxxxxxxxxx>
That picture shows a fine demonstration of terrible bokeh; a pity, as it
draws a lot of attention away from the actual subject. I didn't realise the
50/1.8 performed so poorly at what I call "the bokeh-killer test".
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