I believe what you see is the result of low contrast in the dark wall, scanned on auto with a nearly straight curve.Hmmm Alan, I think your curve is adding "posterization" in shadow side of the wall? Is it reverse S one?
As I remember from 30 years ago, I had no problem enlarging 24x36mm HP-5 negative developed in Emofine to 50x60cm. Grain was not issue even at that magnification.
Rudeofus kindly sent a paper by LFA Mason, J. Photo. Sci 11 1963 p 136 - 139
Among other things, Mason found that a color coupler added to a metol +color developer solution gave a doubling of the silver density produced. Mason suggested that the color developer became superadditive with the metol and regenerated it. I just note this in case anyone wishes to experiment further.
I repeat the MeCD4 formula here:
Bath A
Metol...............................1g
Sodium Sulfite anh..........35g
Color developer CD-4......4g
Sodium Metabisulfite........1g
Water to............................1L
Bath B
Sodium Sulfite anh............35g
Sodium Carbonate anh......30g
Water to..............................1L
Develop 3m +3m 25C, correct the time for other temperatures, I use the Ilfordphoto chart.
Agitate in Bath A 2 inversions every 30s
Agitate in Bath B 2 inversions at start and 2 inversions at half time only.
MeCD4 flattens the S curve of the Aviphot films to some extent giving EI=200 for Aviphot 200 and EI=80 for Aviphot 80.
CD-4 appears generally the least likely of the CD series but it may cause an allergic reaction in some individuals.
Hello Again!
Has anyone here tried the sheet film sizes of the Aviphot 200 being sold here? I just purchased one hundred sheets of 9x12cm. Should be interesting.
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Do either of you have access to a densitometer? It would be nice if either of you have a log exposure plot of developer time temp dilution for aviphot 200. I’m real curious about how much “ straightening is getting done in the highlights. In terms of density value, zone 8, 9,10,11,12,13 tend to have very little difference density, say .05 to .07 per doubling of exposure. The shoulder is usually quite pronounced.
It is quite easy to adjust time and temp and agitation technique to get a c.i. Of 1.25 or so . But I have not found a way to “straighten” the line.
Hello Greg, it would be useful to see the shape of the curve of Aviphot 200 or 80 when developed in MeCD4, post 141, 3m +3m 25C.
My CD-4 was from minilab suppliers Axel Color International of Italy.
It seemed to me that this one with 35g/L sulfite had fine detail rather limited by grain:
https://www.flickr.com/photos/98816417@N08/51624282237/in/dateposted-public/
Since Thornton, Stoeckler 2 bath developers have more sulfite I tried 50 and 75g/L to see if there was an improvement, post 151.
Not a lot of difference.
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