Excel Spreadsheet for Film Testing (EI rating)?

[timlayton]

I am using a 31-step Stouffer step tablet and starting to test my 4x5 sheet film. I have determined my fb+fog for my film and dev combo and and have recorded the density values for each step on the tablet.

I thought before building an Excel spreadsheet from scratch that someone out here probably has a template or file already made that will create the characteristic curve and plot the values on the proper zone? If so, let me know.


Thanks,

Tim

 

[Lee L]

Something like this?

(there was a url link here which no longer exists)

Look through the thread for the most recent version, and thank Ralph Lambrecht for putting it together and making it freely available.

Lee

 

[timlayton]

Michael, I took your advice and took a stab at creating my own chart. It seems simple enough as you say but I am having one problem. The Y axis is the net density (neg. density minus fb+fog) information and the X axis is the exposure.

I am trying to get the X axis to read in zone numbers (0,1,2...10) vs. in step readings (1,2,3...31).

In my first attempt I set my X axis in Excel to the calculated zone number (10 - step density / .3) and I get a result as expected by having the net density fall on the calculated zones.

I must be missing something obvious. How do I get the net density values to plot with the zone numbers? I read the Shaefer book and on page 60 he shows exactly what i want to do but doesn't explain how he did it and certainly not for Excel.

Thanks in advance for any help.

Tim

 

[timlayton]

I figured out my issues and I have the graph working now. I got my EI rating and N development time.

 

[timlayton]

No problem Michael, I appreciate the help. Now I am moving on to figuring out my contracted and expanded dev times and all will be good.

Tim