FP4 plus + Ultrafin liquid - time?

dawid · Jul 9, 2015

Hello all, first time being here. I need an advice, guys. I shot a roll of HP4 plus at ISO 100. I'm goig to use Ultrafin liquid (not Ultrafin Plus) to develop it - dillution 1+20. Any idea what should be development time? Ilford says it is 11 min. (20°C/68°F) at ISO 125 and 14 min. at ISO 200, so what about ISO 100? Will 10 min. be fine, how do you think?

Rick A · Jul 9, 2015

http://www.digitaltruth.com/devchart.php?Film=FP4&Developer=Ultrafin&mdc=Search&TempUnits=C

MrBrowning · Jul 9, 2015

I'd think you'd be fine at 11 minutes.

dawid · Jul 9, 2015

@ Rick A: Well, I have checked digitaltruth before, but it doesn't show time for Ultrafin and FP4 at ISO 100... Thanks anyway.

@MrBrowning: I'll try 11 min. but 19°C/66°F. I know the difference between ISO 100 and 125 is slight but still... Sometimes it's the small things that make a big difference.

MrBrowning · Jul 9, 2015

dawid said:
@ Rick A: Well, I have checked digitaltruth before, but it doesn't show time for Ultrafin and FP4 at ISO 100... Thanks anyway.

@MrBrowning: I'll try 11 min. but 19°C/66°F. I know the difference between ISO 100 and 125 is slight but still... Sometimes it's the small things that make a big difference.

Even if you went to 10 minutes it should be fine and yes it is the little things. But that's only a 1/4 stop. I just ran 6 sheets of Foma 100 at 25. I developed it for my N-1 and it looks to be fine (I haven't printed it yet). FWIW I forgot to change the film speed on the meter before using it.

Thomas Bertilsson · Jul 9, 2015

dawid said:
@ Rick A: Well, I have checked digitaltruth before, but it doesn't show time for Ultrafin and FP4 at ISO 100... Thanks anyway.

@MrBrowning: I'll try 11 min. but 19°C/66°F. I know the difference between ISO 100 and 125 is slight but still... Sometimes it's the small things that make a big difference.

Have you looked at Tetenal's web site?

http://www.tetenal.com/imaging_shop/images/00001805.pdf

It appears that you need to decide first what kind of gamma you want, and then pick a developing time.

If you shoot FP4+ at 100 instead of 125, it will not make any difference in your negatives. Develop as normal. The difference is small enough that it will vanish within the margin of error.

dawid · Jul 10, 2015

@MrBrowning: I did exactly same thing, I forgot to change ISO...

@Thomas Bertilsso: I have looked at Tetenal's website, however I guess I'll stick to what Ilford gives.

RobC · Jul 10, 2015

Tetenal give two gamma values, .55(8 mins) and .7(18 mins). ISO film speed gamma is approx 0.62 so a time somewhere between the two would be correct. 11 minutes seems as good a starting time as any to detrmine if that gives you the contrast want.

FP4 plus + Ultrafin liquid - time?

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