Jobo 3006 streaks on 5x4 negs

Edtog

Member

Joined

Sep 22, 2010

Messages

37

Location

England

Format

4x5 Format

• Nov 26, 2010

• #1

Hi,

I've just developed 6 sheets of 5x4 in my Jobo expert 3006 drum using 650ml of developer (XTOL 1+1, 325ml dev, 325ml water.)

One of the negs has a streak along it where it looks like the developer hasn't evenly reached the neg. I pour in the dev as quickly as the lift will allow and load the negs with emulsion facing towards the centre of the drum.

Am I using enough solution to cover all the negs or is more required?

No pre soak, agitation at approx 50rpm, CPP-2.

Thanks
Ed

 

Keith Tapscott.

Member

Joined

Jun 11, 2005

Messages

1,807

Location

Plymouth. UK

Format

Multi Format

• Nov 26, 2010

• #2

I'm not sure which each numbers on the dial gives in terms of RPM, but Jobo recommend setting 4-P on my CPA2.
Perhaps the drum was rotating too slowly or the processor wasn't on a level surface. Try 1000ml of developer next time and see if that helps.

Capacity of drums here: http://www.jobo.com/jobo_service_analog/us_analog/instructions/instructions_misc_expert_drums.htm

 

Last edited by a moderator: Nov 26, 2010

2F/2F

Member

Joined

Apr 29, 2008

Messages

8,031

Location

Los Angeles,

Format

Multi Format

• Nov 26, 2010

• #3

Hi,

I use my 3010 (the 10-sheet version of your tank) on a manual roller base, and I was told when I got it that I was supposed to spin it at 60 to 75 RPM. Also, according to JOBO, you should use at least 50 mL per sheet of 4x5 black and white. That would give you a 300 mL minimum for your batch. JOBO state the maximum capacity of the tank as 1 L, but perhaps using over double the required amount is too extreme. Perhaps it is too much developer combined with too few RPMs, and the solution is not taking on enough force during rotation to make it all the way to the back of each cavity.

 

OP

OP

Edtog

Member

Joined

Sep 22, 2010

Messages

37

Location

England

Format

4x5 Format

• Nov 26, 2010

• #4

Thanks,
I'll try a faster rotating speed on the next batch and see what happens. I had it on 3 (meaningless figure as I guess all Jobos are slightly different...)
Don't really want to put 1L of dev in in case it overloads the motor.

 

Sirius Glass

Subscriber

Joined

Jan 18, 2007

Messages

50,380

Location

Southern California

Format

Multi Format

• Nov 26, 2010

• #5

What Keith and 2F said. With replenished XTOL use 100% of the time [Ilford takes the time of 8 minutes @ 20 degrees C and adds one minute for HP5+], no presoak.

Steve

 

OP

OP

Edtog

Member

Joined

Sep 22, 2010

Messages

37

Location

England

Format

4x5 Format

• Nov 26, 2010

• #6

Well so far so good, just done 6 sheets of Tri-X and all fine with 600ml (300+300) upping the speed to just under 4 on my CPP-2.

Thanks!!