Thanks Mike,
I'm starting to get a rough idea of what we're talking about. These
seem to be specialty sort of devices. If you were building a 4x5 camera
using ex-military aerial reconaissance lenses and high accutance film
for very high resolution work, would you even consider one of these?
Gene
Michael King wrote:
>
> Used a point source 25 years ago when printing glass slides on a 4x5
> enlarger--talk about dust!! For the "normal" darkroom a diffused light
> source practically eliminates dust spotting, a condenser light source will
> give you enough spotting chores to keep your hand in and a point source
> would be the only thing I can think of that would keep me completely out of
> the darkroom!!!!
>
> Basically a point source light head uses a small, clear bulb, mounted on a
> socket that moves up and down in the lamphouse of the enlarger head, the
> idea is to focus (colliminate(sp?)actually) the light moving through the
> negative so that the light rays are perfectly alligned with the plane and
> aperture of the negative stage. Any dust on the surface of the negative
> will be razor sharp on the print. Any scratches will look horrible. Print
> contrast will be higher and negative grain will be quite apparent.
>
> darkroommike
>
> >In a message dated 5/15/01 8:47:30 PM Central Daylight Time,
> >[EMAIL PROTECTED]
> >writes:
> >
> >
> > > Thanks Junkman,
> > >
> > > I think I would like to know more about this "point source" idea.
> > > Anything more to add?
> > >
> > > Gene
> > >
> >
> >Dear Gene:
> >No, sorry to say. I have never used point source lighting in any of my
> >enlargers. I read about it somewhere, but that was a long time ago, and I
> >can't remember the details now. But I'll bet someone on this list can tell
> >you all about it.
> >Sorry I can't be of any more help on this subject. Best of luck to you.
> >Sincerely:
> >Junkman
>
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