Re: APX 25 ISO rated at 50 - development time????

From: Timo Sund ^lt;[email protected]>
Date: 02/28/05-02:06:06 PM Z
Message-id: <422379AE.7050107@palaios.com>

Sorry about layout. Maybe this helps a little.
Rodinal developes everything.

Kate M kirjoitti:
> Have you got a link to the page Timo cos I can't find it on the

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  Film Developer Dilution ASA/ISO 35mm 120 Sheet Temp Notes
  APX 100 Rodinal 1+50 50 11.5 20C
  APX 100 Rodinal 1+24 64 7.5 20C
  APX 100 Rodinal 1+100 100 20 20 20 20C [17]
  APX 100 Rodinal 1+50 100 13 20C [26]
  APX 100 Rodinal 1+25 100-125 8 8 8 20C
  APX 100 Rodinal 1+50 125-160 17 17 17 20C
  APX 100 Rodinal 1+25 200 11 11 11 20C
  APX 100 (New) Rodinal 1+25 125 8 8 8 20C
  APX 100 (New) Rodinal 1+50 160 17 17 17 20C

---
PUSH PROCESSING (B/W)
     These are general guidelines when no published development times 
are available. To use this chart multiply the published time at 
recommended ASA by the factor in parenthesis (ie. If Tri-X rated at 
400ASA is normally developed for 6 mins in a standard soup, then when 
Tri-X is pushed three stops to 3200ASA development would be: 6 x 4.5 = 
27 mins). Please use these recommendations as starting points only. In 
many cases these times will prove excessive, but when all else fails 
they can be a good guideline. Please note separate data for Tmax films.
         Standard Developer
         1 stop push = (x1.5)
         2 stop push = (x2.25)
         3 stop push = (x4.5)
         Compensating Developer
         1 stop push = (x1.4)
         2 stop push = (x1.85)
         3 stop push = (x2.5)
         TMax Films
         1 stop push = no change
         2 stop push = (x1.33)
         3 stop push = (x1.66)
     *Compensating developers include Microphen, TMax, and any other 
developers which are specifically formulated for push processing
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Compensating factors do work both ways.
Difference Asa25->Asa50 is only -1 stop so I wouldnīt care compensation 
factors at all.
Iīd give Rodinal 1+50 and 11.5 minutes @20C a try.
But itīs based only on my personal opinion and own experience. (and 
chart above)
Iīve done  years ago some work with APX and D-76.
Times were (if I remember right) aroud 13-15minutes
-- 
Timo Sund
Palaios Photos
Finland
http://palaios.com
Received on Mon Feb 28 14:06:53 2005

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