Re: Horseman SW 612 & also 47mmXL

[Joel Seaman <jseaman@xxxxxxxxxxx>]

Mitch,

I was referring to the center filter, not the polarizer.  Allegedly the center filter
is designed to work at a set distance from the lens.  I do not know the
optical/physics techincal  aspects so I am just passing on what has been imparted to
me by those who claim to know.  May or may not be valid.

The Rodenstock brochure shows that the 45MM Apo-Grandagon is a few mm short of
covering the 112MM width on a Horseman 612.  Does this mean that the center filter is
incapable of making up for this optimistic design?  Does this mean that Horseman
should not offer the 612 without disclaimer?  Horseman also offer a 35MM that has
even less coverage!  I believe that Linhof uses the same lens on their 612.  Does
this set up work for anybody?

joel

Mitchell P. Warner wrote:

> Joel,
>         I could understand the restriction on the distance a polarizer is supposed
> to be from the taking lens if it were a lens itself, but seeing as how
> Polarizers are not lenses, but filters, I cannot see the justification.  I
> have used a 95mm circular polarizer and a linear polarizer successfully on
> every lens I own by employing step-down adapter rings. No problem. I have
> never seen any scientifically based information on the distance a
> polarizing filter is from the lens, other than referring to possible
> vignetting.  If you have any information I'd be interested......
>
> Mitch Warner
>
> At 02:33 PM 6/23/99 +0000, you wrote:
> >Don,
> >I have been told by those in the know that polarizers should not be mounted
> >under the center filter, as they are designed to work at a specified distance
> >from the lens.  However, others have told me that they do this with success.
> >
> >joel
> >
> >
> >
> >