Archived posting to the Leica Users Group, 1997/07/10

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Subject: Re: where to get Zone VI Products in Europe
From: "Steven L. Alexander" <alexpix@worldnet.att.net>
Date: Thu, 10 Jul 1997 08:53:40 -0400

I don't know about Zone VI products in Europe but a Panchromatic viewing
filter can easily be found in any cinema equipment supply house. They are
quite commonly available in motion picture circles.

Happy snaps,
Steven

- ----------
> From: Bob Parsons <bobp@dodo.demon.co.uk>
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: where to get Zone VI Products in Europe
> Date: Wednesday, July 09, 1997 8:04 PM
> 
> Martin asked:
> >I know that Zone VI sell a kind of filter you can look through by eye
(not for
> >the camera) to get an impression about the transformation of the colours
> >to black and white.
> >Where can I get such a filter in Switzerland, Germany, England, ...
Europe.
> >
> >Thanks
> 
> snip.
> 
> Martin,
>          The type of filter you ask about is known as a Panchromatic
> Viewing Filter. They are best described as a dirty brown colour, and
> tend to suppress the visual colours in a scene which allows you to judge
> the distribution of light and dark elements. The filter is available as a
> Kodak Wratten filter number 90. You should be able to order one from any
> good photographic shop in Switzerland. The one I have is 75mm square, but
> you can get larger ones. The only problem with the Wratten filters is
they
> are varnished, dyed gelatin, on an acetate base (I think) and are easily
> marked. Mount it in a card holder or between two sheets of clear acetate
> foil or something similar to protect it.
> 
> I've seen adverts for glass or plastic ones which are more robust, but I
> can't remember where.
> 
> I found that after a few seconds the eye/brain combination is good at
> compensating for the effect of the filter so the first one or two seconds
> of viewing is what counts.
> 
> I bought mine in the UK from Silverprint Ltd, 12 Valentine Place, London
> SE1 8QH, Tel. +44 171 620 0844, fax. +44 171 620 0129. It's listed in
> their catalog as Kodak Wratten Filter, Mono Viewing 90, 75x75mm, 12.67
UKP.
> They will accept orders from abroad, their price list says they have a
> minimum order of 25 UKP though :(
> 
> Regards,   Bob Parsons  bobp@dodo.demon.co.uk
>