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  1. #1
    Trond's Avatar
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    How to change aperture on a lens in a recessed lens panel

    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
    Attached Thumbnails Attached Thumbnails PICT4349.jpg  

  2. #2
    calceman's Avatar
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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. #3
    Trond's Avatar
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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

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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. #5

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    Wow that's narrow. Perhaps a outside ring with a descending arm can be attached to the aperture ring. I'm thinking of a small version of a focusing arm one can mount to a Hasselblad lens to aid in focusing.

    http://photo.net/medium-format-photography-forum/00I9b7
    When I grow up, I want to be a photographer.

    http://www.walterpcalahan.com/Photography/index.html

  6. #6
    Trond's Avatar
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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
    Last edited by Trond; 08-07-2009 at 07:23 AM. Click to view previous post history. Reason: Clarified.

  7. #7

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    Quote Originally Posted by Trond View Post
    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
    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. #8

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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. #9

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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. #10
    Trond's Avatar
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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
    Attached Thumbnails Attached Thumbnails PICT4368.JPG  
    Last edited by Trond; 08-07-2009 at 11:35 AM. Click to view previous post history. Reason: Added some details.

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