> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Allen, Bob
> Sent: Tuesday, November 28, 2000 2:42 PM
> To: '[EMAIL PROTECTED]'
> Subject: EOS Halogen lights for close-up?
>
>
> Greetings.
>
> Two people have asked me, I can't find the answer in literature, and I'm
> stumped, so it's onto the EOS list I go. Has anyone tried to use modern
> small halogen lights for close-up work? Price of (some) halogen lights has
> come down, availability has gone up, and I'm intrigued with the
> possibility
> of using them in softboxes for close-up and macro. I don't know the
> temperature of halogen and am unsure if I would need a filter, like one
> needs with tungsten lights.
Halogen lamps, like tungsten lamps, have a color temperature of 3200 degrees
K. In fact, most tungsten lighting doesn't really measure 3200; it generally
falls somewhere below that, around 2600 to 2900. This is why halogens appear
"cooler" (bluer) than most household bulbs.
Shooting under halogens will require either using a tungsten-balanced film
or using filtration (80a). The 80a filter will reduce exposure by 2 full
stops. For close-up and macro use, this may not be a problem. Your greatest
difficulty will be the heat created by the halogen lamps. For this reason,
you may want to put the filtration on the lamps rather than the lens; this
will also have the benefit of allowing you to shoot in mixed light,
artificial and daylight.
As a practical matter, I've found that an 80c filter instead of an 80a is a
good compromise, especially when shooting negative film. There is only a
light loss of 1 stop rather than 2, and the additional correction can easily
be applied in printing.
Chuck Skinner
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