answers to three different types of Kodak chromogenic films

[Skip Middleton]

Well, that answers that, doesn't it. It also goes some way to explain the
less than stellar performance of Portra BW on BW paper...
Thanks for your effort.

--
Skip Middleton
www.shadowcatcherimagery.com
"AC/DCdude17" <Je...@prontoREMOVETHISmail.com> wrote in message
news:3DEFF858...@prontoREMOVETHISmail.com...
> X-No-Archive: Yes
>
> I posted this a day or two ago, but I thought I'd get an answer from
> Kodak as well.
>
> I asked them:
>
> "I have compared the datasheets of all three Kodak
> chromogenic films; BW +400, and Portra BW and
> 400CN from the professional lines. Looking at
> the three curves from each film, 400CN appears to
> be unique, however BW +400 and Portra BW appears
> identical in all three graphs.
>
> Are Portra BW and BW +400 identical film in
> different packaging?"
>
>
> Kodak said:
>
> "
> Kodak Professional Portra 400BW Film, Kodak B&W +400 Film, and Kodak
> Professional T400CN Film share the same grain structure and resolution
> along with the ease and convenience of processing though traditional
> color labs using Process C-41 chemicals. Portra 400BW is optimized to
> be printed on the same printer channel as our Kodak Professional Portra
> Color Negative Films. Kodak Black and White +400 Film is optimized for
> printing on Kodak Gold Film channel. Kodak T400CN Film is optimized for
>
> printing on traditional black and white paper, though with use of the
> Kodak T400CN Printer Balancing Kit, may be printed consistantly on
> traditional color paper.
>
> The appearance of processed negatives on PORTRA 400BW Film and Kodak B&W
>
> +400 film is similar to color negative films, but with no color in the
> negative images, and a much lower D-min or base density. The film base
> will appear very light brown. This is normal, and will not affect image
> quality or printing characteristics. Both films can be printed onto b&w
> papers using slightly higher contrast filters to boost the contrast due
> to the high d-min of the film base.
>
> Only Kodak T400CN film can be "push processed" when higher film speed is
>
> needed (up to a "Push 2 @ EI 1600) and is the only film in the group
> that can be printed onto traditional b&w photographic paper.
>
> Thank you for visiting the Kodak web site
>
> http://www.kodak.com/go/professional
>
> If you should have any questions on Kodak products or services, please
> be sure to revisit our site as we are continually adding information to
> enhance our support. If you need further assistance you may also reach
> us at 1-800-242-2424 ext. 19 (Monday-Friday, 9am-7pm EST)
>
> Regards,
>
> Peter V.
> Kodak Information and Technical Support
> Kodak Professional"
>
>

[Gordon Moat]

Thanks for sharing the information. This makes me want to try out T400CN. I
have shoot several rolls of Portra 400BW, including some cross processing,
and been somewhat pleased with the results. A friend of mine tried the
+400, but she was not too happy with the results, and that was when trying
to get enlargements with good contrast.

Ciao!

Gordon Moat
Alliance Graphique Studio
<http://www.allgstudio.com>

[Bryan K]

Wow, what a great answer from the Kodak people. Never thought they
cared.

Thanks for the info.

[Dan Carp]

In article <3DEFF858...@prontoREMOVETHISmail.com>

AC/DCdude17 <Je...@prontoREMOVETHISmail.com> wrote:
>
> Are Portra BW and BW +400 identical film in
> different packaging?"
>
> Kodak said:
>
> "
> Portra 400BW is optimized to
> be printed on the same printer channel as our Kodak Professional Portra
> Color Negative Films. Kodak Black and White +400 Film is optimized for
> printing on Kodak Gold Film channel.

the three knobs they have for printing capability are:

1) curve shape
2) dyes
3) interimage

it is highly unlikely there are dye differences, you can see this
from dye absorption curves if they publish them

you have already verified curve shape is the same

this leaves interimage, which is controlled through
scavenger/wanderer dyes, once again VERY unlikley there is a
difference, and it will show up on the dye absorption curves

this is another case of Kodak lies
see news:2OTII3NB37577.4327314815@Gilgamesh-frog.org

some technical institute or one of their competitor's ought to
expose their unethical marketing, and users should file a
CRIMINAL complaint of FRAUD and a CLASS ACTION CIVIL SUIT

[Skip Middleton]

What they say is borne out in real world use, so what's your problem?

--
Skip Middleton
www.shadowcatcherimagery.com
"Dan Carp" <Anonymous...@See.Comment.Header> wrote in message
news:JNX1TIKT37597.5144444444@Gilgamesh-frog.org...