Rodenstock Sironar-N mounting and shutter problem

Discussion in 'Large Format Cameras and Accessories' started by blackmelas, Sep 10, 2005.

  1. blackmelas

    blackmelas Subscriber

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    I just bought a used Rodenstock Sironar-N 210mm lens for my Graphic Veiw II. I mounted it to the lens board and it will not sit flat against the board due to a set screw on the back of the shutter, a copal 1. The lens rocks ever so slightly. This screw protrudes about 1mm. The GVII lens board is 3mm thick and the hole is 43mm which seem to meet the lens' requirement from the Rodenstock web page. Am I missing a flange of some sort?
    Also the shutter does not seem to be firing at the correct speeds all of the time. Is this related to the scew?
    Thanks for any help on this problem.
    Best regards,
    James
     
  2. Tom Hoskinson

    Tom Hoskinson Member

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    Remove the screw (check out the comments on shutter and lens mounting on the Steve Grimes website (APUG Sponsor))

    You need either a flange or a jam nut to mount your lens/shutter to the board. Again, check out the comments on shutter and lens mounting on the Steve Grimes website.

    This has nothing to do with the screw. Your shutter needs Cleaning, Lubrication and Adjustment (CLA) and may also need repair. Carol Flutot (APUG member) and Steve Grimes provide these services.
     
  3. jimgalli

    jimgalli Subscriber

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    The purpose of the little set screw is to hold the shutter from rotating in the lens board. If you bore a tiny matching hole in the lens board 1mm deep for that set screw to fall in the shutter isn't dependent on the jamb nut to hold it from rotating. Lots of folks consider them a nuisance and just remove them though. The speed thing unfortunately like Tom said, isn't related.
     
  4. blackmelas

    blackmelas Subscriber

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    Thanks to you both for the quick responses. Darn!@#$$% And I wanted to get shooting. Well, off for cleaning....
     
  5. MikeS

    MikeS Member

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    Jim:

    Does that imply that you use the screw? If so, I also like to use the pin (screw if you want) as well, but most of my shutters already have them removed! Where can I get these screws? Also, is there an easy way to locate the hole more exactly than just doing it by eye?

    -Mike
     
  6. John Koehrer

    John Koehrer Subscriber

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    MikeS
    6" machinists scale?
     
  7. Tom Hoskinson

    Tom Hoskinson Member

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    The little hole for the screw needs to be right at the edge of large hole that is drilled in the lens board to accept the lens/shutter assembly. The clock position of this little hole is arbitrary - determined by how you want the lens/shutter assembly oriented. If you send a lens or a lens flange to SK Grimes for mounting, they will ask you to mark your preferred 0 degree orientation of the lens-shutter-flange with a piece of tape.

    I would expect that SK Grimes has a supply of these little stop screws - if they keep the ones they remove from new shutters.

    I used to drill my lens boards for these little stop screws - but I no longer do this. I find it to be a no value added PITA.
     
  8. Ole

    Ole Moderator Staff Member Moderator

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    I had never seen one until I tried mounting a new old lens - that I'd put in another new old shutter. I hadn't used that shutter before, since it had a dead Angulon in it (missing lens element). To my surprise it had the screw intact. To my irritation I couldn't remove it - it's stuck! So now I'll have to make a very small dent in a lensboard...