How to change aperture on a lens in a recessed lens panel

Discussion in 'Darkroom Equipment' started by Trond, Aug 7, 2009.

  1. Trond

    Trond Subscriber

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    I have a EL-Nikkor 80mm 5.6 mounted in a deeply recessed lens panel for my "new" IFF Ampliator enlarger. The lens panel is very narrow and it's impossible to get the fingers in there to change the aperture. The Nikkor is, I suppose, one of the few 80mm small enough to fit in there at all.

    I was thinking about making an aperture changing tool, perhaps some kind of tube that will fit the aperture ring.

    Any suggestions?

    Trond
     

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  2. calceman

    calceman Member

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    Why not upside down and inside out? That is maybe mounted the wrong way round: the lens should not be in the recessed part, but on top of it.
    Dont see the use of this kind of deeply recessed panel on enlarger.
     
  3. Trond

    Trond Subscriber

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    This enlarger uses screw in type lens panels mounted in a turret, and the lens panel can't be mounted any other way. I don't think it would be possible to focus the 80mm on a flat lens panel.

    Trond
     
  4. bdial

    bdial Subscriber

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    It's amazing that the enlarger requires such a deeply recessed board for an 80mm.
    In any case, some flexible tubing that you can push onto the aperture ring when necessary would work, or possiibly shrink tubing used by electricians. In that case, you buy the closest diameter that fits, then it is shrunk to the exact size with heat.
    If you have a good grain focuser, consider setting it at f/11 or so and leave it set.
     
  5. Pinholemaster

    Pinholemaster Member

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  6. Trond

    Trond Subscriber

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    Thanks for the suggestions so far. I think the flexible tubing probably is the easiest solution, apart from keeping the lens at f/11. A permanently attached arm sound nice too, I will look into that.

    It's possible that the board is more recessed than necessary, but that's the board I've got. I've never seen similar screw in type boards actually.

    Trond
     
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  7. Thomas Wilson

    Thomas Wilson Member

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    Is that not what you are essentially doing here? (in photo)
    I can state with almost certainty that no self respecting engineer would design a collar for an enlarging lens. Your assembly can not be correct.

    Does your cone mount from the narrow end or the wide end?
    Every cone-lens extender I have used mounted to the enlarger at the wide end and the lens mounted to the cone at the narrow end (rear element towards the negative). It was an efficient way of putting some distance between the lens and negative without over-extending the bellows.

    I think your cone is designed to mount a lens in the neighborhood of 360mm, minimizing bellows draw.

    The wide flange of your cone probably fits the same slot as your three lens turret. Use one or the other?
     
  8. Bob-D659

    Bob-D659 Member

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    There was likely an extension ring made for that purpose. Durst supplied Schneider lenses in recessed mounts complete with dedicated extenders that screwed into the front of the lens. They also had a universal fit extender supplied with one lens mounting board extender assembly.
     
  9. srs5694

    srs5694 Member

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    I'm also suspicious of the assembly. My Philips PCS130 enlarger uses a reversible lens board. It's mounted so that the lens board extends upward/inward for 50mm lenses and downward/outward for 75mm/80mm lenses. (The amount of "dip" is trivial compared to what's in your photo, though.) If your enlarger is the same way, mounting a 50mm lens would require an even more recessed mount, and then the question becomes: Was the designer a sadist or just plain insane?

    My advice: Mount the board in the enlarger as it is and see if you can focus. If you can't, reverse your assembly. Don't worry about the aperture ring until you figure out how it's supposed to be mounted.
     
  10. Sirius Glass

    Sirius Glass Subscriber

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    1) If you must use that mounting board, then turn it around and then when you use it, move the lens further away from the easel to compensate for the mount length. That will give you access to the lens focus and the lens aperture.

    2) Pick up a flat mounting board and avoid the problem.

    Steve
     
  11. Trond

    Trond Subscriber

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    The lens board isn't reversible, and if the lens was mounted on a flat board it would be impossible to focus. But the lens board doesn't have to be as deep as this one, it could perhaps be 1.5 - 2 cm shallower (I have tested). I have a feeling that lens boards for this enlarger are hard to come by, but I suppose I could get someone to make one.

    I have attached a photo to illustrate how it's mounted.

    Trond
     

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    Last edited by a moderator: Aug 7, 2009
  12. RJS

    RJS Member

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    How about a longer (i.e. 135mm) lens. Then, if that doesn't work, given the price of good used enllargers I would relegate your "Ampilator" to the trash heap. It can't be any good since A) I never heard of it, and B) what ninny would build a machine requiring such an arrangement?
     
  13. Thomas Wilson

    Thomas Wilson Member

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    Apparently I was wrong, except the part about a self respecting engineer....
    From your picture, it would appear that you have one hell of a nice enlarger, albeit one designed with 5"x7" negatives in mind, not 6x6.

    My advice would be to remove the 80mm lens, bend some 12 gauge copper wire in a forked loop that bends out of the way of the light path, slip the forks into the grooves on the aperture ring, and then tape the hell out of it. Then remount the lens.

    Good luck.
     
  14. Jon Shiu

    Jon Shiu Subscriber

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    Hi, just glue a tab or two onto the aperture ring that extends downward slightly.

    Jon
     
  15. Trond

    Trond Subscriber

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    Thanks for the suggestions! I have lots of great suggestions and ideas to play with now.

    I will have to agree with you about the engineer part, but I have a very strong suspicion that the board is partly home made, and not an original recessed IFF board. The previous owner is a hobby mechanic, and it's quite possible that he made the board himself out of bit and pieces he had available. But he could at least avoided making it so deep.

    Trond
     
  16. ic-racer

    ic-racer Member

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    You are lucky to have recieved that lens mount with your enlarger! I'm still looking for the Durst equivelant ( LARATUB ) to use an 80mm on my Durst. I'd probably just set it at F8 or F11 and keep it there.

    I have a mount almost that deep to use a 25mm on my 4x5 enlarger. But my 25mm is a very tiny lens and I can get my fingers around the aperture ring.
     
  17. Ralph Javins

    Ralph Javins Member

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    Good morning, Trond;

    Ic-Racer mentioned the Durst People and their lens systems. Back in the 1960's they had a sheet metal clamp that went around the aperture control ring of a 50mm lens (Schneider Componon-S 50mm f:4.0) and it had a long tab that hung down from one side. The lens was screwed into a recessed lens board (the IXOTUB for the Durst 606) and the lens was adjusted using this little lever or tab that hung down from the lens inside the recessed lens board. I cannot remember the name or the Durst nomenclature for this accessory.

    It should be possible to make something like this out of sheet metal, brass or perhaps mild steel, and a small screw and nut.
     
  18. Trond

    Trond Subscriber

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    Old thread, but I have now found a satisfactory solution. A friend of mine, who is a hobby woodworker, made a tool for me.

    verktoy3.jpg verktoy2.jpg verktoy1.jpg

    Trond
     
  19. ic-racer

    ic-racer Member

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    Very nice solution!