[pure-silver] Re: Ralph Lambrecht / EM10 enlarging meter?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 6 Jan 2005 09:57:49 -0800
----- 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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