> >> > Komtanoo Pinpimai wrote:
> >> >
> >> >>http://image.xitek.com/photo/200512/1393/139317/139317_1135703164.jpg
> >> >>http://image.xitek.com/photo/200512/1393/139317/139317_1135695236.jpg
> >> >>
> >> >>the center seems to be brighter and more colorful, are they
> >> >>photoshopped ? or the fisheye can produce these kinds of result ?
> >> >>
> >> > All super wide lenses produce images that are darker at edges and
> >> > corners than in the center. It's a consequence of the physics of light,
> >> > the details of which I used to understand. It's worse wide open and
> >> > usually disappears by mid aperture, maybe f8 or so, depending on the
> >> > particular lens.
It never disappears, just gets more gentle. It is a feature of all lenses, but
most noticeable the wider the angle.
> >> > I know ZD lenses are supposed to pass on info about their vignetting
> >> > characteristics to the camera and into the RAW files. It can then be
> >> > corrected in one or another or both of the Oly RAW apps. Maybe in other
> >> > RAW processors too?? It can also simply be corrected in a good image
> >> > editor, using one's eyes and a radial gradiant, rather than info from
> >> > the lens.
Or take some out-of-focus photographs of a blank evenly illuminated
surface and use it to construct an accurate radial gradient for the lens.
tOM
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