Re: Density Base OHP and Stouffer

[Sandy King <sanking@clemson.edu>]

Mark,

After our exchange of last week with different readings from your 
361T and my Gretage D-200II I went back and checked my calibration. 
My densitometer was actually off off by + 0.01 in UV reading the 
Gretag calibration step wedge. If I adjust the reading down by that 
amount my numbers agree with Stouffer Industries for the step wedges.

Sandy







At 8:42 AM -0500 11/27/06, Stouffer Industries wrote:
> Hello Michael,
>
> Our film base can vary slightly from emulsion to emulsion batch in a 
> range of .04 to .06. Our current batch is consistently .05 optical 
> density (visual reading) and .09 UV reading. I don't have any 
> Pictorico OHP to compare but at least I can give you our density 
> readings of our step wedges.
>
> Kevin Morris
> Stouffer Industries
>
> ----- Original Message ----- From: "Michael Koch-Schulte" <mkochsch@shaw.ca>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Thursday, November 23, 2006 10:39 PM
> Subject: Density Base OHP and Stouffer
>
> > I don't own an actual densitometer. My scanner coupled with VueScan puts
> > Pictorico OHP at either LogE of 0.08 or 0.10 and it puts my Stouffer
> > tablet's Step 1 (clear base) at between 0.04 and 0.06. Does this sound
> > close? Do most people use 0.04 or 0.05 (or something else) when calculating
> > the printing time between the two? 0.05 is a bit more convenient because
> > it's 1/6 of a stop. The resulting error is rather small but I'm just
> > wondering. Thx.
> >
> >
> >
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