> Date: Tue, 28 Nov 2000 15:40:20 -0500
> From: "Chuck Skinner" <[EMAIL PROTECTED]>
> Subject: RE: EOS Halogen lights for close-up?
>
> > -----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
>
Hi Chuck.
Thank you for your cogent reply, especially for pointing out the heat
problem that I hadn't fully considered. I don't want to fry the small
insects that I photograph!
Bob Allen
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