[pure-silver] Re: Ralph Lambrecht / EM10 enlarging meter?
- From: titrisol <titrisol@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 6 Jan 2005 08:49:43 -0800 (PST)
I got the basisc of the EM10, but I remembered he mentioned how
to determine the contrast grade of the VC paper to be used, and
that is what I was more interested in.
Midtones are important indeed... How do you calibrate your EM10
for number/time for mid-grays?
I do that using a grayscale (at least the center of it) in a MF
negative carrier and a kodak wedge to determine exposure for
each paper. In that way I have a number/time/result table
Found a good thread at APUG about this.
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "titrisol" <titrisol@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, January 06, 2005 6:59 AM
> Subject: [pure-silver] Ralph Lambrecht / EM10 enlarging
> meter?
>
>
> > Hi
> > I remmeber seeing an article from Ralph Lambrecht a while
> > ago
> > about using the Ilford EM10 for determining the exposure
> > time
> > and contrast required for a print.
> > Anybody knows where to find a copy of it?
> > At least a copy of the curve?
> >
> > Thanks
> >
> >
> I don't have Ralph's paper but he is a member of this
> list. I use an EM-10. Its possible to calibrate the dial in
> stops so that it can be used as a crude densitometer. It
> isn't really sensitive enough to measure denser areas of the
> negative and is very slow for them. However, it can give a
> guide to the required paper contrast with some patience. One
> must learn to choose the right parts of the negative to
> measure the ratio of densities that are to be printed.
> Negative materials can record a much longer range of
> densities than printing paper can reproduce, at least, at a
> visually acceptable contrast.
> I calibrated my EM-10 by using the iris of an enlarging
> lens and checking against another. Make sure you stop down
> about two stops before using this method to eliminate the
> non linearity that can come from vignetting. A better way
> would be to use neutral density filters of known value.
> Jones, Nelson, and others at Kodak Labs discovered long
> ago that mid range tones are the most important to the eye.
> If the mid tones are good the eye will accept shadows and
> highlights which are lacking somewhat in detail. Generally,
> these will be within the range of the EM-10. The measurement
> is made by placing the sensor in the area of interest and
> turning the dial until the green green light goes on.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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