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Subject 
Author 
Date 
Re: average gradient 
Mike Scarpitti  17:59 27 Feb 06 
higher than expected efs 
Miles  13:54 6 Jul 03 
I finally run my first film test in my new darkroom I used Delta400/xtol 1+1 @ 72F. this is my 1st use of Delta 400 and what I noticed was that the b+f seems to be substantial and I had a time deciding a good starting point for the test exposure. None the less I did the test using the btzs tubes and a mantis densitometer. I used the winplotter program. According to the charts I get an effective film speed for Delta400/xtol 1+1 combo of 600 to 900 for a Gradient of 0.4 to 0.9. Is this possible? Well I just loaded the film data into my Palm tungsten/t and 2 4X5 film holders and I am heading out the backdoor to see if this "increase" in speed is real. What errors on my part might push the film speed spuriously up?
 
Re: higher than expected efs 
Miles  15:11 6 Jul 03 
Re: higher than expected efs 
Phil  17:35 6 Jul 03 
Re: higher than expected efs 
Miles  19:25 8 Jul 03 
btzs third edition 
Abel Sykes  20:01 5 Jul 03 
Re: btzs third edition 
Phil  12:36 6 Jul 03 
Re: btzs third edition 
Abel Sykes  12:44 6 Jul 03 
adjustment for temperature 
phil sweeney  5:26 5 Jul 03 
Re: adjustment for temperature 
Phil  6:56 5 Jul 03 


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