[pure-silver] Re: contrast changes
- From: "Eric Neilsen Photo" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 28 Feb 2010 10:28:52 -0600
Ralph, It sounded to me as if she just raised the enlarger to spread the
light to fill her paper with image. I don't think she did any measuring. The
little Ilford EM 10 is also a great little device for this. It is quite easy
to do a measurement and do the math. If light spill is an issue in an
increase from 8x10 to 11x14 there are probably more underlying issue in that
darkroom. That is not a big change. I also don't put much into the change of
size from 8x10 to 11x14 influencing contrast as both prints are still a hand
held event and not like going from a contact or 5x7 to a 20x24. Exposure
could very much be the issue as an underexposed print can be flat as the
dmax was never reached. however, without seeing the difference we are all
making guesses ; )
Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
www.ericneilsenphotography.com
skype me with ejprinter
_____
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Ralph W. Lambrecht
Sent: Sunday, February 28, 2010 7:06 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: contrast changes
That should work, but I understand it is also what Shannon did. If I
understand correctly, exposure is not his issue, contrast is.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
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On Feb 28, 2010, at 13:59, Jean-David Beyer wrote:
Ralph W. Lambrecht wrote:
Shannon
One more thought. Exposure is the product of illuminance and time. By
opening up the aperture, you were able to keep the exposure time consistent,
but you increased the illuminance to provide the
increased exposure required to cover the larger format.
I have a Beseler color analyzer. I do not care to do color printing anymore,
but the thing works.
One use I have for it is just in situations like this.
I make 8" x 10" test prints, and use the same kind of paper (but different
emulsion numbers) for each size. When I get a print I like, with the
exposure I like, I measure the illuminance falling on the paper with the
analyzer, and then raise the enlarger head to get the size I want for the
larger print. I then open up the lens to get the same illuminance. Since I
use the same exposure time, this should correct implicitly for reciprocity
failure in the paper. Since I use the same illuminance, this corrects for
different enlarger height and magnification ratio.
This procedure does not correct for flare in the darkroom affecting the
larger print differently, nor does it correct for any psychological effects.
In the past, with Kodak, Ilford, and Oriental Seagull, I have not noticed
much difference between different batch numbers of the same papers.
--
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