Results 1 to 9 of 9

Thread: Jobo 2550 Tank + "Color by Beseler" Motor Base

  1. #1

    Jobo 2550 Tank + "Color by Beseler" Motor Base

    Hello Everybody,

    I'm Théo from France. I'm 24 years old, and i begin to shoot with an US Camera. A Speed Graphic Graflex 4x5.

    I'm at the step of the processing. But i have a lot of question about the system of the Beseler Base. I explain.

    I use "Microphen" developer, on the explanation of this developer, it is written : "For rotary tank with continuous agitation and no presoaking, reduce above development by 15%". I found this sentence a little blurry. Because, all rotary system have not the same speed and other settings can change. I have a rotary base "Color by Beseler" with no reverse system.

    I have make a simulation. I have put the two 2509n spire in my 2550 tank + 600ml of water. I have use my chronometer and my Jobo Tank make 40 revolution per minute.

    So, i'm a little confusing about 2 things:

    First: At which % i must adjust my developing time, with all this information? (I know for exemple that a CPE2, works at 30rpm in "speed 1" and 75rpm in "speed 2")

    Second: I have seen a lot of person on many page of this forum who say that they don't change the sense of the Jobo tank during the rotation in unic direction. And a other person change the position of the tank... So: "Who is right?"

    Thanks to help me

  2. #2

    Join Date
    Sep 2012
    Location
    Sunshine State
    Posts
    899

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    1) For rotary tank with continuous agitation, reduce development time by 15% compared to inversion film development, for example, inversion development is 10 min, your start rotary development time will be 8.5 min. Use 30 rpm, speed 1.
    2) 30rpm in "speed 1" and 75rpm in "speed 2": 30rpm speed 1 is for film development; 75rpm speed 2 is for print development.
    3) Unidirection or reverse direction: make sure your tank can have one full rotation in each direction when you use reverse motor base, or you need convert your motor base to unidirectional.

  3. #3

    Join Date
    Jun 2014
    Posts
    1,786

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    Rotation speed doesn't really matter for development time. It's continuous agitation and that's what counts.
    Uou may find you get uneven development at certain speeds; some find better results at high speeds, some at low speeds.

  4. #4

    Join Date
    Aug 2000
    Location
    California
    Posts
    3,515

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    That information is for a Jobo processor.
    I use both a Jobo and a smaller base like the one you have.
    It is very easy to get carried away with minute details when processing. Simplify the process, especially in the beginning.
    Don't worry about the speed of your base. I suggest you start by developing 1 or 2 negatives in the rotating tank for your regular tray time and 1 or 2 for 10-15% less. Print these and decide which works best to give you the kind of print you prefer.

  5. #5

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    Quote Originally Posted by diversey View Post
    1) For rotary tank with continuous agitation, reduce development time by 15% compared to inversion film development, for example, inversion development is 10 min, your start rotary development time will be 8.5 min. Use 30 rpm, speed 1.
    2) 30rpm in "speed 1" and 75rpm in "speed 2": 30rpm speed 1 is for film development; 75rpm speed 2 is for print development.
    3) Unidirection or reverse direction: make sure your tank can have one full rotation in each direction when you use reverse motor base, or you need convert your motor base to unidirectional.
    Thanks Diversey. My Beseler base is unidirectional.

  6. #6

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    Quote Originally Posted by koraks View Post
    Rotation speed doesn't really matter for development time. It's continuous agitation and that's what counts.
    Uou may find you get uneven development at certain speeds; some find better results at high speeds, some at low speeds.
    In fact, i have heard that. Some people prefer low speed and other high speed...!

  7. #7

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    That information is for a Jobo processor.
    I use both a Jobo and a smaller base like the one you have.
    It is very easy to get carried away with minute details when processing. Simplify the process, especially in the beginning.
    Don't worry about the speed of your base. I suggest you start by developing 1 or 2 negatives in the rotating tank for your regular tray time and 1 or 2 for 10-15% less. Print these and decide which works best to give you the kind of print you prefer.
    Thanks for your help Jim! I have only a Beseler base

    I have put the Jobo speed to compare with my base... And for the sens of the tank i must change it during the process? Or do you think it is not useful?

  8. #8

    Join Date
    Jun 2014
    Posts
    1,786

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    You'll have to see how it goes with the tank rotation in one direction all the time. You may or may not get uneven development. If you get bands of unevenness, you know what the possible cause would be.

  9. #9

    Re: Jobo 2550 Tank + "Color by Beseler" Motor Base

    Quote Originally Posted by koraks View Post
    You'll have to see how it goes with the tank rotation in one direction all the time. You may or may not get uneven development. If you get bands of unevenness, you know what the possible cause would be.
    Thanks. So i will try with 15%

Similar Threads

  1. Jobo 3005 tank and Beseler Motor Base
    By xmishx in forum Darkroom: Film, Processing & Printing
    Replies: 6
    Last Post: 27-Jul-2016, 15:31
  2. Jobo 3005 and beseler motor base
    By Jordan in forum Darkroom: Film, Processing & Printing
    Replies: 3
    Last Post: 19-Jul-2009, 17:57
  3. RPM for Jobo 3010 with Beseler motor base?
    By brian steinberger in forum Darkroom: Film, Processing & Printing
    Replies: 10
    Last Post: 29-Nov-2006, 17:35

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •