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[OM] Re: ZD 8mm fisheye

Subject: [OM] Re: ZD 8mm fisheye
From: Komtanoo Pinpimai <romerun@xxxxxxxxx>
Date: Fri, 27 Jan 2006 06:48:26 -0600
The  vignett will appear when the F number is small right ? (in fisheye?)

On 1/27/06, C.H.Ling <chling@xxxxxxxxxxxxx> wrote:
>
> It is absolutely not the quality of ZD8mm, either flash or PS was used on
> their shot. Here are some photos I took with E-1 and ZD 8mm. Processed with
> PS CS2 no vignetting correction done.
>
> F5
> http://www.accura.com.hk/P1201881s.jpg
>
> F5.6
> http://www.accura.com.hk/P1212081s.jpg
>
> F8
> http://www.accura.com.hk/P1212048s.jpg
>
> F6.3
> http://www.accura.com.hk/P1212091s.jpg
>
> C.H.Ling
>
>
> ----- Original Message -----
> From: "Moose" <olymoose@xxxxxxxxxxxxxxx>
>
> > 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.
> >
> > 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.
> >
> > Moose
>
>
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