Re: Kodak HIE/HSI and flash bulbs

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

On  9 Aug 99 at 14:08, Gary Beasley wrote:

> At 08:32 PM 08/09/1999 +0200, you wrote:
> >Gary,
> >
> >Thank you for the suggestion - unfortunately it is the flash bulb output in
> >terms of Joules/Lumens/GN etc that is of interest.  I have a variety of
> >bulbs ranging from the sublime to the ridiculous.
> >
> >Have alwaus harboured a desire for one of those bomb flashes that used to
> >be used for night aerial photography :-)
> >
> >We have a new tethered helium balloon in the city centre here in Bristol
> >that has unfortunately rekindled my interest in infrared night photography.
> >Luckily I am too busy to investigate it further at the moment ;-)
> >
> Tell me, would a flash meter get a reading from a flash bulb? My Minolta
> III flash meter will read through an 87C filter, maybe something like that
> would allow testing a few bulbs for relative output and derive a useful
> guide number from that.
> Gary Beasley
> http://beasleyglb.home.mindspring.com/

I very vaguely recall that for flash intensity a second sensor is
used, not just an extra time-circuit on the same sensor as an
ambient reading....this *might* mean a different sensor too, with at
least slightly different spectral sensitivy....



--                 
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'!]
*
****
*******
******************************************************
*  To remove yourself from this list, send:          *
*         UNSUBSCRIBE INFRARED                       *
*       to                                           *
*         MAJORDOMO@xxxxx                            *
*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
******************************************************