UV filter between film rails?

["Christoph Held" <Held@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Dear all,

as already stated a few weeks ago I am collecting my first 
experiences with UV photography now. For static subjects the normal 
strategy seems to work quite well, i.e. UV-lens, SB-140 flash, 
tripod, focussing first, then mounting the filter in front of the 
lens, measuring, then taking the picture.
Quite a lot of my subjects (many insects) are very volatile, however, 
and not as easily attractable as bees to a flower. For reasons I 
don't want to discuss any further I would like to avoid killing or 
freezing or whatever handling of these animals in order to keep them 
still long enough.

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?
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.

Thanks


Christoph Held
Fakultaet Biologie
Abt. Systematik der Tiere
Universitaet Bielefeld
D-33501 Bielefeld
Germany
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