to test EI for color negatives

to test EI for color negatives

i am so happy i now can home test speeds of b&w negatives. i adapted
the method from Adams's books which told me how to find 0.1 density
point on the negative by using a lightbox and a spot meter. it's
great.

now i am considering color negatives and is trying do the similar
things on them. i always send color negatives out to a lab for
developing, and again, i dont have a densitormeter. can i test speeds
( up to the same lab i used ) of color negatives at home?

thanks.

-
woody

Re: to test EI for color negatives

In article <1171507815.338961.217430@j27g2000cwj.googlegroups . com >,
Steven Woody <narkewoody@gmail . com > wrote:

>now i am considering color negatives and is trying do the similar
>things on them. i always send color negatives out to a lab for
>developing, and again, i dont have a densitormeter. can i test speeds
>( up to the same lab i used ) of color negatives at home?

I don't see why you couldn't use the same method. A little experiment
might be needed though.

--
* w w w .spinics . net /digicam/

Re: to test EI for color negatives

On 2=D4=C215=C8=D5, =CF=C2=CE=E712=CA=B104=B7=D6, e...@no.spam () wrote:
> In article <1171507815.338961.217...@j27g2000cwj.googlegroups . com >,
>
> Steven Woody <narkewo...@gmail . com > wrote:
> >now i am considering color negatives and is trying do the similar
> >things on them. i always send color negatives out to a lab for
> >developing, and again, i dont have a densitormeter. can i test speeds
> >( up to the same lab i used ) of color negatives at home?
>
> I don't see why you couldn't use the same method. A little experiment
> might be needed though.
>
> -- * w w w .spinics . net /digicam/

for B&W negatives, i find the 0.1 density above base + fog for Zone 1
exposure. for color negatives, i don't know what density i should
find Zone 1 exposure because there are more than one dyes on the film.

-
woody

Re: to test EI for color negatives

In article <1171544329.701012.92710@j27g2000cwj.googlegroups . com >,
Steven Woody <narkewoody@gmail . com > wrote:

>for B&W negatives, i find the 0.1 density above base + fog for
>Zone 1 exposure. for color negatives, i don't know what density
>i should find Zone 1 exposure because there are more than one
>dyes on the film.

Then you should do tests and see what you like. But I doubt more
than one dye will be an issue. Try 0.1 and see if you like the
result.

Re: to test EI for color negatives

On 2=D4=C216=C8=D5, =C9=CF=CE=E710=CA=B114=B7=D6, e...@no.spam () wrote:
> In article <1171544329.701012.92...@j27g2000cwj.googlegroups . com >,
>
> Steven Woody <narkewo...@gmail . com > wrote:
> >for B&W negatives, i find the 0.1 density above base + fog for
> >Zone 1 exposure. forcolornegatives, i don't know what density
> >i should find Zone 1 exposure because there are more than one
> >dyes on the film.
>
> Then you should do tests and see what you like. But I doubt more
> than one dye will be an issue. Try 0.1 and see if you like the
> result.

does it mean that you think the zone I is the exposure which produces
densities on all dyes of a color negative add up to 0.1 plus base
+fog ?

thanks.

-
woody

Re: to test EI for color negatives

In article <1172239708.847082.148380@8g2000cwh.googlegroups . com >,
Steven Woody <narkewoody@gmail . com > wrote:

>does it mean that you think the zone I is the exposure which
>produces densities on all dyes of a color negative add up to 0.1
>plus base +fog ?

That'd be a good starting point at least. It's the same principle
as black and white: you are looking for where the film starts
responding to light.

Re: to test EI for color negatives

In article <1172257189.794670@no.spam>, ellis@no.spam () wrote:

> In article <1172239708.847082.148380@8g2000cwh.googlegroups . com >,
> Steven Woody <narkewoody@gmail . com > wrote:
>
> >does it mean that you think the zone I is the exposure which
> >produces densities on all dyes of a color negative add up to 0.1
> >plus base +fog ?
>
> That'd be a good starting point at least. It's the same principle
> as black and white: you are looking for where the film starts
> responding to light.

Sounds good,.....

To the OP:

Be careful of equating transmissive values and actual density........

It might be a good starting point, but the dyes won't be a perfect .1
because they transmit light differently. They spread out across the
complete plot "family" .
--
George W. Bush is the President Quayle we never had.

Re: to test EI for color negatives

On 14 Feb 2007 18:50:15 -0800, "Steven Woody" <narkewoody@gmail . com >
wrote:

>i am so happy i now can home test speeds of b&w negatives. i adapted
>the method from Adams's books which told me how to find 0.1 density
>point on the negative by using a lightbox and a spot meter. it's
>great.

Which of Adams' books? Can you summarize here?

Thanks,


Father Kodak

Re: to test EI for color negatives

On Feb 25, 4:06 pm, Father Kodak <dont bot...@IDontCare . com > wrote:
> On 14 Feb 2007 18:50:15 -0800, "Steven Woody" <narkewo...@gmail . com >
> wrote:
>
> >i am so happy i now can home test speeds of b&w negatives. i adapted
> >the method from Adams's books which told me how to find 0.1 density
> >point on the negative by using a lightbox and a spot meter. it's
> >great.
>
> Which of Adams' books? Can you summarize here?
>
> Thanks,
>
> Father Kodak


in 'The Negative', Adams introduced a method of using a spot meter to
measure film density. 0.3 unit of EV difference ( in log 2 ) in your
meter means density difference of 0.1 ( in log 10 ). that's it.