[pure-silver] Re: Ralph Lambrecht / EM10 enlarging meter?
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 06 Jan 2005 18:45:23 +0100
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
On 1/6/05 5:49 PM, "titrisol" <titrisol@xxxxxxxxx> wrote:
> 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
>>
>>
> ==============================================================================
> ===============================
>> To unsubscribe from this list, go to www.freelists.org and
>> logon to your account (the same e-mail address and password
>> you set-up when you subscribed,) and unsubscribe from there.
>>
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Read only the mail you want - Yahoo! Mail SpamGuard.
> http://promotions.yahoo.com/new_mail
> ==============================================================================
> ===============================
> To unsubscribe from this list, go to www.freelists.org and logon to your
> account (the same e-mail address and password you set-up when you subscribed,)
> and unsubscribe from there.
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
