[pure-silver] Re: Ralph Lambrecht / EM10 enlarging meter?
- From: titrisol <titrisol@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 6 Jan 2005 11:53:31 -0800 (PST)
Mine says 22.
Yep, i ran a series of test opening/closing diaphragm using a
grayscale. It acts sorta like a densitometer, and I found the
curve very useful to dtermine the contrast
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
> To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, January 06, 2005 9:45 AM
> Subject: [pure-silver] Re: Ralph Lambrecht / EM10 enlarging
> meter?
>
>
> > I'll send you what I have directly. However, I'm not sure
> > my calibration
> > works for you. Every EM10 is a bit differently calibrated,
> > the calibration
> > number is on the bottom of most, but I don't know what it
> > means.
> >
> > As Richard already stated, you need to calibrate the dial
> > in stops. A stop
> > is a density difference of 0.3 log. Paper contrast is
> > defined in negative
> > density ranges. For example grade 2 has a negative density
> > range of 1.05,
> > consequently, 3 1/2 stops. I'll send you a table of those
> > too.
> >
> >
> >
> >
> >
> > Regards
> >
> >
> >
> > Ralph W. Lambrecht
> >
> >
> The number on the bottom is a nominal setting for
> Ilfochrome. The meter was originally designed for
> Ilfo/Cibachrome printing. Mine is marked 28, I suspect that
> most of them have this number. It is about right for Iford
> and Kodak VC paper for about a 20 second exposure, at least
> on my enlarger. I originally calibrated the dial to allow
> using other times and stops and then realized I could use it
> as a densitometer over its range of sensitivity. Its a very
> useful meter despite being quite cheap. I think they are
> still around $30 US.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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