RE: How to make Kodak Step Table?

Thanks for the info Mark.
 
I exposed a few digital negatives made from Pictorico film printed on my
Epson 2200 as well. In general I have been over exposing but your
information gives me a better procedure to follow. I don't have a
densitometer to measure base and fog for my 4x5 negs but I still have the my
base & fog Zone 6 test data for my 35mm and 6x7 film. Unfortunately I don't
have data for Pictorico film although it may be in the Alt List archive.
 
Thanks again,
 
Gerry G

-----Original Message-----
From: Ender100@aol.com [mailto:Ender100@aol.com]
Sent: Tuesday, September 06, 2005 2:48 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: How to make Kodak Step Table?

Hi
In a message dated 9/6/05 8:34:56 AM, GGILIBERTI@controlotron.com writes:

Mark,

I recently started to make some POP prints again (8x10 Chicago Albumen Works
paper) and included your 31 step scale during the exposures (sunlight).
Could you tell me how I can utilize the data of your scale in this type of
printing situation? Since I lose density during gold toning and fixing I
would like to create a "relatively" repeatable system for these sun
exposures. For these tests I used both digital negatives, standard film 6x7
and 4x5 negatives. (Note: My digital negatives are still lacking since I
haven't perfected the process yet.)

Hi,

Are you going to be printing with in-camera negatives?

To use the 31 step to determine exposure time with an in camera negative,
you would have to over-expose the steptablet on the paper and then do your
toning and fixing and let it dry and determine how many steps are merged
(equal print density). Then you back off the exposure by the number of
merged steps minus 1. Since each step is 1/3 a stop (Log .10 Transmission
Density), you back off 1/3 a stop for each step. Example: if 3 steps are
merged, you back off 2 steps, or 2/3 a stop.

Now, this assumes that the Base + Fog of your in-camera negatives is the
same as that of the steptablet, which is about log .03. If it is higher,
then you have to then increase this standard printing time to account for
that.

I don't work with in camera negatives so perhaps others on the list might
give you some suggestions or tricks to use.

Best Wishes,
Mark

Mark Nelson
Purchase the eBook & PDN System for Your Own Custom Digital Negative
Workflow @
Precision Digital <http://www.precisiondigitalnegatives.com/> Negatives
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Received on Tue Sep 6 14:11:00 2005