Re: Kodak HIE/HSI and flash bulbs

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 9:10 pm -0400 6/8/99, Gary Beasley wrote:
Sniplet
>>Does anyone have the old Kodak data sheet which shows the guide numbers for
>>old press and similar flash bulbs for use with Kodak High Speed Infrared
>>film?
Snip
>>If anyone has this data sheet I would be extremely grateful for a copy and
>>will of course be happy to include it in the IR FAQ rewrite.
>>
>>
>>All the best,
>>
>>             Clive

Snippety

>You might could estimate the EI by comparing the color temperature of the
>sources and mapping a sliding ratio from one end of the scale to the other.
>My 1975 Photoguide shows aluminum clear flash at 3800K, zirconium clear
>flash at 4200, blue flash at 5500K ( this could skew things as the blue
>filter may not affect the IR output), electronic flash at around 6000K, 100
>watt bulb at 2900K, Photolamp at 3400K. Anyone know if the spectrum of
>heated aluminum or zirconium is non linear as far as IR?
>We know the tungsten bulbs have twice the IR as visible so that gives us an
>approximate start for one end and the other is one to one. Hopefully the
>flashbulbs will fall on the line in between and allow a calculation for the
>guide numbers.
>Gary Beasley
>http://beasleyglb.home.mindspring.com/

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 ;-)




All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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