New RPX 400 in Pyrocat

Hello,

has someone made an attempt to develop the new Rollei RPX 400 in Pyrocat ? Or any ideas about a starting point ?

Hints welcome.

Regards,
Lars

Lars,
I'd say 10:00 to 11:00 minutes @ 70F. Here is a chart to give you an idea.
Suggested Development Times










70f 75f 80f

Acros 100 8:00 min 6:30 min 5:15 min
BPF 200@100 8:00 min 6:30 min 5:15 min
Delta 100@125 8:00 min 6:30 min 5:15 min
Efke 25@35 7:00 min 5:30 min 4:00 min
Efke PL 200@100 12:00 min 9:30 min 8:30 min
FP4+ 125 8:30 min 7:15 min 5:15 min
HP5+ 400 10:00 min 8:00 min 6:00 min
J&C 400@350 10.00 min 8:00 min 6:00 min
TMAX-400@500 10:00 min 8:00 min 6:00 min
TRI-X 320@400 10:00 min 8:00 min 6:00 min


Assumptions
The suggested times assume a 1:1:100 dilution of Pyrocat-HD (One Part A + One Part B + 100 Parts Water), with rotary development in Jobo or BTZS tubes.

Contrast Index
These times, at the temperatures indicated, should give an approximate CI of .56 when measured with a densitometer in blue mode, appropriate for printing on graded silver papers of #2 contrast. For variable contrast silver papers be sure to increase development times by about 35%.

Rotary Processing
When developing with rotary processing, either Jobo or BTZS type tubes, use a minimum of 75 ml of the standard working solution per sheet of 4X5 film, (minimum of 250 ml of working solution for a sheet of 8X10 film). A pre-soak of two minutes is recommended as good practice with rotary processing.

Tray or Tank Development
For developing in tray with shuffle agitation, or in tanks with agitation every 30-60 seconds, increase time of development by about 15%.

Minimal Agitation
Pyrocat-HD gives negatives of very great acutance with minimal agitation. When using minimal agitation be sure to extend development time by about 50% over normal time for rotary processing, and agitate every two or three minutes. Minimal agitation is recommended only when the adjusted development time is about fifteen minutes or more.

Guidelines
The suggested development times are guidelines. Do not hesitate to increase or decrease time of development over the recommended times if your prints have too little or too much contrast

Thanks a lot. Something like 11-12 mins would have been my first guess also.

Lars

LarsAC said:

Thanks a lot. Something like 11-12 mins would have been my first guess also.

Lars

Click to expand...

I use Pyrocat-MC myself so let me know how this works out for you. I probably won't be buying any RPX400 since it's more cost on this side of the pond than in EU, but you never know. John W

Developed a first roll yesterday in Pyrocat-MC for 10:30mins at 22C. Looks good at a first glance. Will report how it prints in the next few days.

Thanks for sharing your ideas.

Lars

Just to finish up on this: 16:00 at 20C is better for printing (EI 250-320). If I had to develop more of this, I might extend the time by another minute.

Anyway, my rolls are all done and I won't buy the fillm again. I don't consider it a bad film, but I'll stick with HP5.

Lars