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Thread: HP Combi-Plan 4x5 tank and agitation

  1. #1

    HP Combi-Plan 4x5 tank and agitation

    I recently got 3 HP Combi-plan 4x5 tanks and I'm going to use this tank mainly for semi stand development.
    I learned how to agitation when using this tank as a daylight tank on YouTube.

    By the way, I wonder how high the film carrier should be lifted when initial agitation in the darkroom.
    And do I need to tap the film carrier against the inner wall or top outer border after the initial agitation?
    Also, I'd like to know the internal thread size of the outlet at the bottom of the tank.

    I would really appreciate your advice.
    Thank you.
    Chamonix 45N-2, Chamonix 45H-1

  2. #2

    Join Date
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    Re: HP Combi-Plan 4x5 tank and agitation

    I always use pre-flush with water for a couple of minutes to remove air bubbles and anti-halation.

  3. #3

    Re: HP Combi-Plan 4x5 tank and agitation

    Does pre-flush mean pre-soak?
    Chamonix 45N-2, Chamonix 45H-1

  4. #4

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    Re: HP Combi-Plan 4x5 tank and agitation

    Yes.

  5. #5

    Re: HP Combi-Plan 4x5 tank and agitation

    Thanks. I'll try presoak too.
    I wonder how to agitate in the darkroom.
    Chamonix 45N-2, Chamonix 45H-1

  6. #6
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    Re: HP Combi-Plan 4x5 tank and agitation

    Put the lid on and invert several times just like a tank for roll film. Rap the tank on the counter after initial inversion to dislodge bubbles. I use this exact method in an HP Combiplan for both regular and semi-stand developing. It's just a tank, nothing special - I don't even use the fill/drain mechanisms.
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    All comments and thoughtful critique welcome

  7. #7

    Re: HP Combi-Plan 4x5 tank and agitation

    Thanks for the input, appreciated.
    The solution filling/draining time was slow, so I tried to agitate with the lid open.
    Chamonix 45N-2, Chamonix 45H-1

  8. #8

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    Re: HP Combi-Plan 4x5 tank and agitation

    The way I have seen it done is by filling the tank with developer and then loading it in darkness, putting the lid on and then continuing in the light with normal agitation. Repeat for each step. That would fix the problem with the fill/drain times and ensure proper agitation .

  9. #9

    Re: HP Combi-Plan 4x5 tank and agitation

    I see your point. Thank you.
    Chamonix 45N-2, Chamonix 45H-1

  10. #10

    Re: HP Combi-Plan 4x5 tank and agitation

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    I attached a CatLABS compensating development timer to the lid of the Combi-Plan tank.
    I wanted to be less concerned about temperature changes in hot summer or cold winter.
    I'm only going to use this tank for semi-stand development.
    Chamonix 45N-2, Chamonix 45H-1

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