RE: UV photography & Tiffen makes 87 IR filter

["Christoph Held" <Held@xxxxxxxxxxxxxxxxxxxxxxxxx>]

> UV Reflectography is the recording of the UV light reflected
> from the subject which is when you use a 18A or the slightly
> lighter 18B. This is as you rightly say used to show skin damage
> and other forensic work.  (We are also just about to start doing
> it here, I am just waiting for the filter to come!).  You can
> use both colour and b+w but I believe some colour film work a
> lot better than others but I am currently not sure which.
> (Warmer tone slide perhaps?)

Following an advice from B. Rorslett I used Fuji RTP with very 
acceptable results. Reddish colour cast can become a problem when not 
properly exposed though. 

> The special Nikon lens you mentioned I believe is for short-wave
> UV work, as glass blocks out these wavelengths of light so the
> lenses are made from a form of quartz.  As for the use of a UV
> transmitting filter over the flashes may I enquire why?  This
> would surely only be needed if one was not in place over the
> camera lens.

The Nikon flash SB-140 requires such a filter when used in Auto mode. 
A sensor takes a reading and would otherwise be fooled by visible 
wavelength output of the flash. I strongly recommend using it in TTL 
mode though if at all possible.

I have to say that I was interested in this technique for a 
scientific project only and I can claim no particular expertise. 

Have a look at this webpage:
http://hawk.foto.no/pinhole/nikon/index.html

Good luck

Christoph Held
held@xxxxxxxxxxxxxxxxxxxxxxxxx
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