Fuji Neopan Prof 1600 developing?

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veke

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Good morning. The film mentioned in the title but rated ISO 400 instead of ISO 1600. TMax developer (not the replenish version but the other). What time would you recommend, 20C temperature preferred? And the dilution, 1:4 or 1:9?
 

Keith Tapscott.

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It would probably be around 6 minutes in the 1+4 dilution at 20*C, but I have never tried that combination. I always used D-76 with that film.
 
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veke

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thank you, Keith. I just made the stock solution of D-76, at the moment too warm for developing but when it has cooled down near 20C I will try with that instead of Tmax Dev. What time/dilution/temperature would you use for the film rated ISO 400?
 

Keith Tapscott.

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I would let the D-76 settle for a day or two. Diluting it 1+1 , try 8 minutes at 20*C. The negatives may be on the dense side at ISO 400, but very printable.
 
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veke

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I will try that. Why does the stock solution have to settle for 1-2 days. I was thinking about 1-2 hours. The temperature is now about 25C and as I pour water to make it 1:1 it will be quite nicely 20-22C. What is the magic in settling for 1-2 days?
 
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Dear Veke,

I would imagine the film will now be out of date ? that may affect processing times.

Simon ILFORD Photo / HARMAN technology Limited
 
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veke

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Dear Simon,

good point. The film is out of date, some years, and I must increase the time perhaps 15-20 per cent, a guess. Thank you, Simon.
 

Keith Tapscott.

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The time chart I have just found for D-76 1+1 gives 7 minutes at 20*C and 8 minutes for 18*C. Given the age of the film as Simon has mentioned, 8 minutes at 20*C should be very close.

Allowing D-76 to settle for a day or two is something I do out of habit. IIRC, I read somewhere that the pH of the solution fluctuates a bit when first mixed, but settles after a day or two in brimfull bottles. I could be mistaken though.
 
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veke

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Keith, did you look at the ISO 400? I found a chart and it says that for ISO 800 7min in 20C. For ISO 400 5 and a half. The film is as I mentioned ISO 1600 but it is exposed for ISO 400. Good I didn´t start developing before I know how to develop.
 

john_s

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The Neopan 1600, like Delta 3200 and TMax 3200, is not really its advertised speed. The Neopan 1600 is more like 640 real speed if you want some shadow detail, so your 400 exposures are probably pretty close to normal.
 
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veke

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Keith Tapscott.

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Keith, did you look at the ISO 400? I found a chart and it says that for ISO 800 7min in 20C. For ISO 400 5 and a half. The film is as I mentioned ISO 1600 but it is exposed for ISO 400. Good I didn´t start developing before I know how to develop.
The slip of paper I kept from an old film box didn't mention ISO400, hence why I said that the negatives may be on the dense side. I am glad you found the full technical data for ISO 400. :smile:
 
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veke

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Keith: I will try with the Fuji chart. Hopefully they have tested their own film :smile:. 5,5 minutes in 20C 1:1 dilution plus 30 seconds for the film out of date, makes 6 minutes altogether.

P.S. I used the 5.5 minutes, no compensation due to expired date. No prints available at the moment but as fas I can estimate the negatives looks good, no problems to print.
 
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