hp5 developing in 510 pyro

w rollinson · Jul 9, 2007

could anybody give me a rough starting time for hp5 in 510 pyro ,120 film i know everybodys different but there are no times at the massive dev chart for this thanks ,wayne

jstraw · Jul 9, 2007

For standard agitation at 68 degrees (30 seconds initial, 10 seconds every minute) I've been using eight minutes for 1:100 dilution with a two minute presoak. I start timing when the pour-in is finished and begin pouring out at 7:45.

I'm now working on my time for rotary development...something near 6 1/2 minutes....

w rollinson · Jul 9, 2007

thanks thats great is a presoak nessesery i have been using hp5 in 35mm but i have never done a soak (is there a reason for soaking) thanks wayne

thefizz · Jul 9, 2007

w rollinson said:
thanks thats great is a presoak nessesery i have been using hp5 in 35mm but i have never done a soak (is there a reason for soaking) thanks wayne

It washes off the anti-halation layer but more importantly it helps to bring the film to the correct temperature.

Peter

w rollinson · Jul 9, 2007

thanks thats great i will give it a go all the best ,wayne

jstraw · Jul 9, 2007

thefizz said:
It washes off the anti-halation layer but more importantly it helps to bring the film to the correct temperature.

Peter

It also saturates the emulsion. Thoroughly wetting it can help prevent airbells (bubbles...creating voids in the development)...as I recently learned by not having a true presoak before rotary development.

juan · Jul 10, 2007

Just to stir the pot, I'll point out that Ilford recommends NO presoak on any of their films. I've never really understood why and presoak myself.
juan

John Bond · Jul 11, 2007

In part, the answer depends on if you plan to print on graded paper or variable contrast paper. For graded paper, 6min, 30 seconds should be close. For variable contrast paper, seven minutes or a little longer might be better unless you prefer to increase the contrast filtration on your enlarger to 3.5 or more. I have recently tried semi stand development with great results- 1:500 for aobut 45 minutes with three gentle agitations.

mikebarger · Jul 11, 2007

I have to say my experience is following John's comments. I FINALLY have the darkroom up and running and negatives are requiring more filtration than I would have guessed.

I going to bump up my development time, actually use Picker's test for development time, to get closer to normal.

Mike

jstraw · Jul 11, 2007

John Bond said:
In part, the answer depends on if you plan to print on graded paper or variable contrast paper. For graded paper, 6min, 30 seconds should be close. For variable contrast paper, seven minutes or a little longer might be better unless you prefer to increase the contrast filtration on your enlarger to 3.5 or more. I have recently tried semi stand development with great results- 1:500 for aobut 45 minutes with three gentle agitations.

John, that's how I process my FP4+ sheet film...50 rather than 45 minutes though. Initial 30 seconds, then four inversions at 12.5, 25 and 37.5 minutes.

mikebarger · Jul 11, 2007

Mike

Are you printed on graded or VC?

Mike

jstraw · Jul 11, 2007

VC, Primarily Kentmere Fineprint but some MGIV FB still, as well.

hp5 developing in 510 pyro

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