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Messages 531 to 540 of 653 (Total: 653) First | Prev | Next | Last
Subject 
Author 
Date 
Re: adjustment for temperature 
phil sweeney  2:53 8 Jul 03 
Densitometer or light meter 
Sam Carleton  19:34 5 Jun 03 
Re: Densitometer or light meter 
Phil  17:57 6 Jun 03 
Re: Densitometer or light meter 
Dominik Schenker  11:21 10 Jun 03 
Determining push processing development times 
Sam Carleton  9:45 4 Jun 03 
Re: Determining push processing development times 
Phil Davis  11:30 4 Jun 03 
Re: Determining push processing development times 
Sam Carleton  12:20 4 Jun 03 
Re: Determining push processing development times 
Phil  17:08 4 Jun 03 
efs and speed point 
Richard Kettles  8:22 23 May 03 
I have done a film test using HP-5 plus and ddx. Unfortunatly my speed point was in the 2.7 range. If I used the highest speed point reference in plotter at 2.6 my efs an efs ranges from 500 at g5 to 425 at g. 7.5 and back up to 500 at g 8.5. I know these figures are wrong and the film dev combo would probably give me an efs of around 320-400.
My guestion is until I do the test over again can I photograph at iso of around 400 and use my curves to obtain a reasonably good development time? 2'nd why would my film speed be increasing from 425 at g. 7.5 to 475 at g8.5?

Thanks Richard
 
Re: efs and speed point 
Phil  11:07 23 May 03 


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