Hi Gene,
There is no doubt that some of them are visually much more white-looking
than others, due to newer phosphors. Whether they are good enough for
variable-contrast papers to be used without adjustment of printing time, and
whether the full range of contrasts can be gotten, can only be determined by
trying them. There is also the problem of changing light output with
warmup. Maybe it might work better to have a lens cap that you remove to
make the exposure so that the fluorescent light source could be fully warmed
up before exposure.
Bob S.
>From: Gene Johnson <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: [Cameramakers] Speed Graphic Enlarger/spectral trouble
>Date: Tue, 19 Jun 2001 06:59:24 -0700
>
>Robert,
>
>You know,I think that may be changing. These bulbs seem very white.
>Much whiter than other flourescents I've seen in the past. I'm seeing
>other flourescents like this now too. I'm wondering if there has been
>some improvement in the technology. Kind of hard to tell with the eye,
>but I think some of them even mention "full spectrum" or something
>similar on the packaging.
>
>Gene
>
>Robert Stoddard wrote:
> >
> > Hi Matt,
> > The problem is that fluorescent lamps don't have a continuous spectrum
>of
> > colors of light as a hot filament lamp does. This probably would not be
>a
> > problem if you are using single contrast-grade B&W enlarging paper,
>since it
> > would only affect the time required to print. If using multi-contrast
> > paper, it might cause some trouble because of the fact that the color of
>the
> > light must be changed to get the different contrasts.
> > RkS
> >
> > >From: Matt Mengel <[EMAIL PROTECTED]>
> > >Reply-To: [EMAIL PROTECTED]
> > >To: Cameramakers <[EMAIL PROTECTED]>
> > >Subject: [Cameramakers] Speed Graphic Enlarger/spectral trouble
> > >Date: Mon, 18 Jun 2001 07:18:41 -0700 (PDT)
> > >
> > >Thanks to everyone on the speed graphic light head
> > >stuff. I think I have enough info to get started BUT,
> > >there have been some concerns here as to spectral
> > >problems with different light sources. Can anyone shed
> > >some light (sorry) on what the problem(s) would be. I
> > >am not at all familiar with this. If I used a source
> > >with the wrong color temp. what would happen? I'm
> > >speaking in the B&W sense of course.
> > > Also, I mentioned earlier the Ansel Adams book, "The
> > >Negative". After I actually READ the book instead of
> > >just reading captions, I got a little more insight on
> > >the type of enlager he was describing. If anyone is
> > >interested just about any library has this series.
> > > Thanks
> > > Matt
> > >
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