On Monday, October 14, 2002 at 4:58:13 PM UTC-5, na...@company.com wrote:

On Mon, 14 Oct 2002 14:24:11 -0700, Ronald Bruck <bruck@math.usc.edu>
wrote:

I have a number of slides which are labeled "Anscochrome". In
researching this on the web, I discover this was a (slow) positive
film. Thus I suspect Anscochrome was used for duplicating slides.

Can anyone verify that this was (at least a common) use for this film?
Is it still in use? What do people use today?

And how much resolution was lost by the analog process of duping a
slide?

--Ron Bruck

Anscochrome was simply a GAF color slide film - available in a couple
of speeds - 40 and 100. Nothing special about it - just another
competitor for Kodachrome. You refer to it as "slow" but keep in mind
that Kodachrome at that time came in 25 and 64 with Ektachrome at 100
and High Speed Ektachrome at 200 and, by special processing, 400.
All of these names and numbers are from memory so pardon me if I've
muddled any of it.

Kodak's Ektachrome in the early 1970's was 64 and 160 ASA (ISO) and the 160 could be pushed to 400. Ansochrome from GAF in the early 1970's came in 64, 200 and 500 ASA making the latter two the fastest slide film you could buy. asco's color was more
neutral than Ektachrome and like Ektachrome it could be processed at home. GAF went out of the film business around 1975-76 and at that point Kodak came out with Ektachrome 400. GAF 500 speed film was extremely grainy and some people claimed it was
really closer to 400 speed. I used it and loved it. I also liked the 200 speed. 64 was the slow speed chosen to match the 126 cartridge cameras that used that speed. It was available in 35 mm and 126 and could be purchased with processing included or
without so you could buy a kit and do it at home. It did not use the E4 chemistry that Kodak used for Ektachrome.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, October 14, 2002 at 8:44:57 PM UTC-5, James Robinson wrote:

Ronald Bruck wrote:

I have a number of slides which are labeled "Anscochrome". In
researching this on the web, I discover this was a (slow) positive
film. Thus I suspect Anscochrome was used for duplicating slides.

No, Anscochrome was a standard slide film, a competitor to Kodak's
Ektachrome line. It was introduced in about 1955, and used the E4
process. Ansco was based in Binghamton, NY, and was owned by GAF at the time. There was an ASA 64 version, and they later came out with an ASA
200 version, which was the fastest slide film available at the time. In
about 1970, the parent company renamed the film GAF slide film, and used Henry Fonda as their spokesman. The film was popular because it was inexpensive.

Ansco made other types of film along with photographic paper. Their
parent, GAF, manufactured inexpensive consumer cameras and slide
projectors. They stopped producing the film in the mid-1970s.

Can anyone verify that this was (at least a common) use for this film?
Is it still in use? What do people use today?

If you are asking about duplicating film, Kodak manufactures a film specifically for this purpose called EDupe. It will accurately render
proper skin tones in the duplicate, and will not accumulate contrast as
a standard reversal film would. It is somewhat difficult to use, since
you have to color balance each batch of film you are trying to
duplicate, and it is a bit of a trial and error process. For best
results, you need an accurate light source with dichroic color
correction filters.

GAF had their own process for the slide film. although similar to E4 you could not use E4. Probably due to patent issues, the process was similar but not the same. I remember you had to still re-expose the film to light after the first processing steps.
Kodak used a chemical fogger instead by this time. GAF sold home processing kits which I bought to process at home. I do not know what the name of the process was. Originally developed from Agfa's color films in the 1940's it might have been very
similar to Agfachrome. In the mid 1970s it came in 126 and 35mm (and I think 120) and was in the 64, 200 and 500 speeds. Kodak changed process from C22 to C41 in this time period and GAF had just finally gotten a good color negative film out for C22.
They sued Kodak and eventually won, but by this time they had decided to exit the film business. Fuji entered the US market around this time and benefited from the court order that forced Kodak to share patents and film formats with competitors.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, October 14, 2002 at 2:24:11 PM UTC-7, Ronald Bruck wrote:

I have a number of slides which are labeled "Anscochrome". In
researching this on the web, I discover this was a (slow) positive
film. Thus I suspect Anscochrome was used for duplicating slides.

Can anyone verify that this was (at least a common) use for this film?
Is it still in use? What do people use today?

And how much resolution was lost by the analog process of duping a
slide?

--Ron Bruck

I know this is a tad dated, but...can anyonetell me what process/s was/were used to develop ANSCO color film in the early 50s? Was C-22 around then, or what was there?
Thanks.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

wolfgangsdaddy@gmail.com wrote:

On Monday, October 14, 2002 at 2:24:11 PM UTC-7, Ronald Bruck wrote:

I have a number of slides which are labeled "Anscochrome". In
researching this on the web, I discover this was a (slow) positive
film. Thus I suspect Anscochrome was used for duplicating slides.

Can anyone verify that this was (at least a common) use for this film?
Is it still in use? What do people use today?

And how much resolution was lost by the analog process of duping a
slide?

--Ron Bruck

I know this is a tad dated, but...can anyonetell me what process/s was/were used to develop ANSCO color film in the early 50s? Was C-22 around then,
or what was there?

If it was a positive slide film then it wouldn't be C22, I think that
was a colour negative process. It's the E series processes that were
for positive film. E-6 was introduced in 1977. In the 1950s it would
have been E-1 or E-2 but they were just the Kodak proprietary
processes, other film manufacturers could well have used their own.

For E series history the best Wikipedia article is:-
https://en.wikipedia.org/wiki/Ektachrome

--
Chris Green
·

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)