Re: IR/UV Photography Products in the '96-1997 Nikon Product:

[Scott Donkin <photos@xxxxxxxxxx>]

At 12:28 AM 29/10/96 +0000, you wrote:
>     Listers,
>     
>     Nikon has two interesting items in their current Full Product Guide: 
>     one lens and on flash.
>     
>     (1) 105MM F/4.5 UV Nikkor AIS:
>     
>     "This lens has been specially manufactured for use with UV light. Its 
>     highly transmissive properties allow UV rays to pass virtually 
>     unimpeded through the multi-lens design. Supplied with an AF-1 Gel 
>     Holder, UR-2 Adapter Ring and Nikon UV filter."

These lenses are very expensive to buy.  They use Quartz elements.

Basically, normal optical glass cuts wavelenghts at around 320nm.  The
Quartz glass cuts down around the 250nm mark.  So you are not getting a lot
more for the hell of a lot more money.

I like the (typical) camera manufacturer jargon... "allow UV rays to pass
virtually unimpeded".  The "UV band goes down to 10nm.  Mind you, UV down
the scale that far has to be man made, as the far UV (UVC) is blocked by
(what's left of) the earths atmosphere.


Cya...

   ______
   Sco||                E-mail:   photos@xxxxxxxxxx
                       Fidonet:   3:713/914.11

..due to the current economic situation, the light at the end of the tunnel
has been turned off until further notice.


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Topic No. 7