On 5 Jan 01 at 16:33, Pierre Bellavance wrote:
> At 11:58 1/5/2001 -0800, you wrote:
>
> >--- Pierre Bellavance <[EMAIL PROTECTED]> wrote:
> > > Thanks for the info.
> > >
> > > I wonder what it looks like.
> > >
> > > As someone else said, it seems that you can choose
> > > where the maximum effect
> > > will be: On the left, in the center or on the right.
> > >
> >I'm not sure how you could do this without changing
> >the picture. As Henry said, maximum polarization is at
> >90 degrees from the sun. Unless you move your
> >position, camera angle, or wait for the sun to move,
> >that's not going to change.
>
> No, this would be because the view with a 20mm lens is so wide that the
> angle to the sun changes from left to center to right.
>
> Pierre
And all this only applies if a) you shoot in landscape mode, and b)
have a clear unobstructed view on the sky (instead of a much more
appealing 'look-through' composition, with trees or buildings on the
left and/or right).
Camouflaging the variable nature of polarisation this way becomes
even more important with color-polarizers (Cokin & Hoya, in mono-
and duo-color), since the un-eveness of polarisation then shows as a
color difference, more than just a density difference (like with a
normal pol).
But I might be biased, using an internal pol filter even on my 8mm/f4.0
Sigma....but nothing beats contrasty clouds and deep green grass or
foliage....:))
More considerations about this controversy of polarisation and
wide-angles:
http://www.a1.nl/phomepag/markerink/pol_wide.htm
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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