Re: 18A UV pass filter for studio strobe lights

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

On 17 Apr 99 at 12:11, Rolland Elliott wrote:

> WJ also responded to my message saying:
> "UV-reflective photography means recording patterns on
> film which are invisible to thehuman eye, and this
> requires an UV-sensitive film....but *because*you are
> recording UV-only in this case, all you can expect is
> amonochromatic image (b&w or color)....unless you can
> find a film that has more than one layer of (final)
> color, sensitive to smalldifferences in UV (say
> 360-380nm creates blue, 380-400 createsgreen, and
> 400-420nm creates red)....but AFAIK, such films
> don'texist, it's all monochromatic in this range."
> 
> My responses:  WJ, have looked at the following Web
> site I mentioned above
> (http://hawk.foto.no/pinhole/nikon/index.html)?  This
> site clearly shows UV color photographs that have red
> blue and white colors in them and are deffinetely not
> monochromatic.  The only explanation I can think of is
> that the Nikon 18A equivalent filter allows UV light
> and some red light to pass through it.  Therefore the
> pictures on this web site are not "pure UV
> photographs" because they are formed by UV light AND
> red visible light. Does this sound right to you?

What you *could* try is juggling with the light balance you throw on 
your subject. While normal daylight might result in a dominance of 
blue, and only tiny dots of red, tungsten light might normalize that 
balance, and give you more color contrast. Add warming/conversion 
filters to increase this effect.
At the other part of the spectrum is UV-only light of course. 


--                 
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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