[LargeFormat] Ultrabiglargeformatcamera

[largeformat@f32.net]

<<All done with computers and laser
printers now.>>
Richard et all,
This was my business for over 25 years.  This is not entirely true.  There
are loads of offset printers that have still not converted to desktop  yet.
They will because the materials are drying up and the cameras are gettting
rarer and the parts are getting harder to get. I about 6 installs to do in
the next month to convert these guys into the digital age.

lee\c
----- Original Message -----
From: "Richard Knoppow" <dickburk@ix.netcom.com>
To: <largeformat@f32.net>
Sent: Thursday, March 06, 2003 3:18 AM
Subject: Re: [LargeFormat] Ultrabiglargeformatcamera


>
> ----- Original Message -----
> From: "Jim Brick" <jbrick@elesys.net>
> To: <largeformat@f32.net>
> Sent: Wednesday, March 05, 2003 3:13 PM
> Subject: Re: [LargeFormat] Ultrabiglargeformatcamera
>
>
> > The camera is a process camera, used by the semiconductor
> and printing
> > industries for decades. I ran one of these in the early
> 60's. As process
> > cameras go, this one is not particularly large. Those used
> for making
> > semiconductor masks make this one look like a toy.
> >
> > Process cameras for the printing industry used arc lamps
> (later pulsed
> > xenon lamps) and were used to make line and halftone
> negatives.
> >
> > Process cameras for the semiconductor industry used a very
> sharp cutoff
> > green light and lenses that were made to be exceedingly
> sharp only at that
> > one wavelength. These cameras were made to be able to
> reduce man made
> > semiconductor layer tape-ups (very large) down to
> microscopic size for
> > masks from which to manufacture integrated circuits.
> >
> > The big process cameras were focused by the numbers. Not a
> loupe and ground
> > glass. A crank on the back to dial-in the number for the
> percentage reduction.
> >
> > Jim
> >
> >
>   Note the sprint shock mounts on the bed!
>   The whole theory and practice of making half-tone plates
> is fascinating. Its now almost a lost art, particularly the
> original method using cross-screens made of ruled glass.
>   The half-tone process was capable of very good quality
> when done right but it more often was not. The average
> quality of half-tone work done now is enormously better.
>   Until the 1950's the medium of choice was wet plate
> colloidion but it was rapidly displaced by self-screening
> film which eliminated the need for the cross-screen and
> special apertures. All done with computers and laser
> printers now.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
>
>
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