Re: UV filter between film rails?

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

On  1 Jul 97 at 8:52, Christoph Held wrote:

>  Willem-Jan Markerink <w.j.markerink@xxxxx> wrote:
> 
> > On 30 Jun 97 at 13:21, Christoph Held wrote:
> > 
> > > The question is more or less twofold: 
> > > Can a UV transmittent filter be mounted between the film rails of the 
> > > camera, thus enabling focussing with mounted filter?
> > 
> > Theoretically yes; the main problem is the fact that UV short pass 
> > filters are made from glass. You can get 0.5mm and 0.2mm thickness 
> > made (with a minor compromise towards blocking the visible spectrum), 
> > but exact cutting will be your main problem.
> > My EOS-1 has a very slight protrusion (0.1mm) on the inside of the film 
> > rails, on top and bottom. This way I can seal the filter light tight 
> > to the film window. AFAIK Nikon's don't have this protrusion, the 
> > film rails are flush with the film window. 
> > 
> 
> Just checked the F4 and FG-20 bodies, they all look similar to my 
> EOS-1 with respect to the protrusion between the film rails. 

Note that I ment protrusion on top and bottom; left and right is okay 
with all cameras I know.

> BUT: are you telling me that you are using a *glass* filter between 
> the rails? Sounds like a very difficult operation to cut and fix it 
> between the rails precisely. 

I only used an opaque IR filter thusfar, and those come in 0.1mm and 
0.4mm thick polyester, and are easy to cut (though 0.1mm precision to 
get it light tight is not easy). That is why I said glass would be 
more problematic....:-))

> But anyway, which filters are useful and where to get them from? Do 
> you use adhesive tapes to fix them in their place?

Yep, simple adhesive tape. If it gets messy after removal, I can 
simply clean it with alcohol. A 0.4mm thick #87C is sitting in my 
EOS-1 for almost a year now.

If there would be a common size for those film windows, I could
order a batch of these filters for a decent price pro filter (high
minimum order costs)....still won't be as cheap as the polyester 
filters though.

- -- 
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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