Re: 18A UV pass filter for studio strobe lights

[Andrew Davidhazy <ANDPPH@xxxxxxxxxxxxxxxxxx>]

> I don't think you are correct.  Take a look at the
> following web site:
> http://hawk.foto.no/pinhole/nikon/index.html
> The photographer, Bjørn Rørslett, uses a Nikkor 105 mm
> UV lens with a Nikkon 18A filter and gets three
> distinct colors in his pictures: red,  blue and white
> using reflective UV photography techniques.  If he can
> do it, why can't I?

The possibility of his having a filter with significant "red" leakage is
indicated. This became evident when I looked at a couple of his photographs
taken directly into the sun ... where the sun's disk had so overexposed the
film that it was in fact white. It is surrounded by a halo of red/pink color
indicating significant red leakage.

It would be interesting to see the spectral transmission curves for the filter
he is using. In any case, a better technical explanation for the results he
shows would be good to see. 

Andy
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