Re: Infrared Flash Again

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

On 10 Jul 98 at 17:10, John & Kristy Braud wrote:

> Group,
> 
> Recently I asked if anyone knew of an infrared flash that was available and
> got several responses so thanks for that. But what I meant to ask is there a
> flash head other than the Sunpak 622 module that emits only IR. My purpose
> is for surveillance photography but I need an invisible burst of light and
> absolutely can not be seen. Does anyone know of one even used like the
> Sunpak Nocto 4000 that is no longer made. Thanks again.

First: a completely invisible flash is very difficult, probably even 
impossible at these intensities. Note that I am talking about looking 
into the flash, not the reflection off the subject (which can indeed 
be invisible).

Second: what info do you have about this Nocto 4000?
I found a used one some months ago, but the price was high 
(US$250....a used 622 could be found for this amount as well, not?), 
and I still haven't found any spec's of this unit (the seller didn't 
know diddly squat either).

Third: with IR filters on an ordinary flash you can mimick this
invisibility, but completely invisible is impossible. 

- -- 
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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