Re: UV filter between film rails?

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

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. 


> Is there a (more or less) constant ratio of UV versus measured (by 
> camera metering system) light, so that I could dial in a compensation 
> in order to obtain a (more or less) correct exposure?
> 
> As you can see by my questions, I am pretty much a beginner in this 
> field, so every advice will be appreciated.

I recommend "IR- und UV-Fotografie" by Guenter Spitzing, if you don't 
already have this book (German!).
 

- -- 
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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