8x10 sheet film D-76 in Jobo 3005 tank

Anybody developing Tri-X 8x10 sheet film (TXP) with D-76 in the Jobo 3005 tank ? Kodak recommends almost 1 liter of 1:1 working solution per sheet (80 sq in), but the maximum capacity of the drum is 1500 ml, so I don't think I can follow Kodak's recommendation for 5 sheets (The 3005 tank can develop up to 5 sheets at once). I am looking for time recommendations to develop 5 sheets of 8x10 in 1500 ml of D-76 1:1 or full strength. By the way, I exposed the film at E.I. 160, and I use the CPA-2 Jobo processor, usualy at 70 deg F (21 deg C) or thereabout.

Thanks much in advance.

- Phong

Dear Phong,

I use the Jobo 3005 to develop my 8x10 tri-x sheet film. I think you miss-read the kodak recommendation for the amount of developer required per sheet in a jobo. My understanding is that Kodak recommends 100 ml. of developer per sheet, not 1 liter per sheet.

Personally, I use 125 ml. of D-76 1+0 per sheet, or 625 ml. for a run of 5 negatives. I do not process fewer than 5 sheets at a time. I either wait until I have 5 sheets, or I will use dummy sheets--out of date film exposed to zone 5 density or 1 single sheet fully exposed to equal 2 normally exposed sheets. This is a trick John Sexton uses to insure consistent development.

For my platinum negs, I develop the sheets at 20 degrees C for 9 min, in D76-1+0, setting the rotation between the two lowest markings on the dial.

I have not done a full blown neg test for silver negs. But, I did earlier develop some negs for platinum that I needed to be thin, which test printed well on grade 1 1/2 silver. I used 1 liter of D76 1+1 (500 ml D-76 plus 500 ml. water), 9.5 min at 20 degrees, same rotation speed.

The capacity on the tube lists its maximum. Nevertheless, Jobo recommends that you do not exceed 1 ltr. of chemical at any time.

If you look on the Jobo site they recommend 200 ml of solution for each neg, for a maximum of 1000 ml in that drum--if you're using D-76 1:1 that will insure you have enough developing agent for complete development at whatever time you choose. I haven't used Tri-X for a long time so I don't have any recommendations for developing time. Best of luck.

John

Hi,
I process 8x10 Tri-X on 3005 Drum on a CPP2. 1 liter for 5 sheets is enough. The CPA engine might be limit for the 3005 drum filled with solution. Be carefull.
I process it with Wimberley WD2D+ and get excellent results.
Iso 200 - 12 minutes at low speed - 21 degree -

My guess with D76 1+1 would be to start at 10 minutes.

Best regards

Guillaume