Re: BTR Filters & Medium Format

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 21 Jan 00 at 14:53, Clive Warren wrote:

> At 10:40 am -0800 20/1/00, shopper@xxxxxxxx wrote:
> 
> >
> >Hello to all, I am looking for information on mounting an 87c filter
> >behing the shutter of my medium format camera.  The archives
> >have lots of "filters" but no between the rails.  I have a Bronica EC
> >and have been using Roland Elliotts cut down 70mm 220 HIE wiith
> >good results.  I seem to recall several months ago someone
> >introducing the subject but I never saw a reply, maybe there was
> >none.  A year or so back I remember WJ being "associated" with a
> >Bronica EC (?).
> >
> >I'm sitting here in a serious snow storm--in Alexandria, Virginia
> >more than three flakes can stop the Federal government--and going
> >over my negatives and contact prints. I really love my 87c filter on
> >my 35mm cameras and also love 220 HIE.  I would really like to
> >get the two together.  Suggestions, ideas, referals?
> >
> >Jim Wood
> 
> 
> Hello Jim,
> 
> Replied to Pete's related question with an answer discussing Bronica S
> series cameras.
> 
> Bottom line is that there is so little room between the back of the shutter
> and the film plane that fitting the polyester filter would be a real
> challenge.

Note that while #87C comes in a 0.4mm sturdy quality, the slightly 
lighter #87 can be had in 0.1mm, same thickness as gelatine.
This might allow it being squeezed inbetween two otherwise mating 
surfaces (and if nothing else, compensate for IR-focus....:-)).
(at 0.25% of focal length, this would be on spot for a 40mm lens....;-))

Willem (still pondering about modifying a Mamiya-RB rotating adapter 
with a #87C) Jan 

PS: did anyone know that Linhof made such an IR-focus spacing-plate 
for their 6x7 Aerotechnica? Lovely engineering....:-))

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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