jam-nut size questions(EL-NIKKORS)

Discussion in 'Enlarging' started by DanielStone, Nov 11, 2010.

  1. DanielStone

    DanielStone Member

    Messages:
    3,107
    Joined:
    Dec 30, 2008
    Location:
    Los Angeles
    Shooter:
    Multi Format
    hey all,

    I'm currently watching a 210mm el-nikkor on the 'bay, for my 4x5 negs, but it doesn't have a retaining ring(jam nut) included with it.

    also, I just received a 63mm (3.5, NOT 2.8) el-nikkor in the mail, and it doesn't have one either, so I'll need one for it too.

    planning on making some masonite lensboards anyhow :smile:.

    any ideas of where I can get one for EACH, and how much they would cost?

    thanks

    -Dan
     
  2. ann

    ann Subscriber

    Messages:
    2,920
    Joined:
    Sep 10, 2002
    Shooter:
    35mm
    I would think b&h and freestyle would have them, think at least 10-15 dollars.
     
  3. Jim Jones

    Jim Jones Subscriber

    Messages:
    2,429
    Joined:
    Jan 16, 2006
    Location:
    Rural NW MO
    Shooter:
    Multi Format
    I've also used Leica Thread Mount flanges and extension tubes for jam nuts on enlarging lenses.
     
  4. Dan Henderson

    Dan Henderson Member

    Messages:
    1,888
    Joined:
    Feb 6, 2005
    Location:
    Blue Ridge,
    Shooter:
    4x5 Format
    Isn't 210mm kind of long for enlarging 4x5 negatives?
     
  5. Ian Grant

    Ian Grant Subscriber

    Messages:
    18,094
    Joined:
    Aug 2, 2004
    Location:
    West Midland
    Shooter:
    Multi Format
    As Dan says you'll struggle using a 210mm for 5x4, it'll hamper making decent sized enlargements.

    A 135mm Copmonon/Componon S is designed for 5x4 and is a very practical focal length for a bench enlarger, if your enlarger is floor standing then q 150mm is a good choice as well.

    Ian
     
  6. David Brown

    David Brown Subscriber

    Messages:
    3,604
    Joined:
    Feb 16, 2004
    Location:
    DFW, Texas
    Shooter:
    Multi Format
    The 63mm Nikkor should be a 39mm (leica) thread. The jam nuts are common enough. I agree with the others that you should be looking for a 135-150 for your 4x5 negs.
     
  7. dentkimterry

    dentkimterry Subscriber

    Messages:
    109
    Joined:
    Jul 12, 2007
    Location:
    Kalamazoo, M
    Shooter:
    Large Format
    The 210mm EL-Nikkor takes a 72mm retaining ring. The 63mm f2.8 takes a 39mm ring. Don't know about the f3.5. Not sure where you can get one. Maybe Nikon parts has one.

    Terry
     
  8. Mike Wilde

    Mike Wilde Member

    Messages:
    2,933
    Joined:
    Aug 10, 2006
    Location:
    Misissauaga
    Shooter:
    Multi Format
    I have DIY'ed a square plate aluminum lens board and fimo modelling clay jamb nut when I owned a Beselar 23 and was shy on a board for a rarely used lens to cover 6x9, since I principally shot 6x6.

    I put the lens though the hole in the board (mine had a hole that was a tad oversized), and rolled the Fimo into a long round ribbon that I wrapped around the protruding threads and pressed into place. I left it to dry for a few days, and then trimmed excess that had been 'extruded' on the far side with a sharp knife. I took a Sharpie black marker to the dried clay , and that was that. We were good to go.
     
  9. Smudger

    Smudger Member

    Messages:
    287
    Joined:
    Aug 9, 2004
    Location:
    Dunedin,New Zealand
    Shooter:
    Multi Format
    Just to add to Mike Wilde's post,I did something similar with a 150 EL-Nikkor,which has an exotic and hard to obtain jamb nut.
    I used epoxy putty,and greased the thread on the lens with petroleum jelly before assembly.
    The lens can be unscrewed if required.
     
  10. ic-racer

    ic-racer Member

    Messages:
    7,483
    Joined:
    Feb 25, 2007
    Location:
    Midwest USA
    Shooter:
    Multi Format
    SK Grimes will make what you need if you can't find one. Look around first. Mike123 had a bunch of flanges (I got a 75mm from him) and rings but he is gone now.
     
  11. MartinP

    MartinP Member

    Messages:
    1,487
    Joined:
    Jun 23, 2007
    Location:
    Netherlands
    Shooter:
    35mm
    Isn't the 39mm thread a standard metric one ? Any metal shop can put a hole is some steel and thread it for you, though it would be more convenient (and probably cheaper) to find one ready made. The idea of packing epoxy round a greased thread can work too - I have tried that succesfully for ventilation system parts with good results.
     
  12. ic-racer

    ic-racer Member

    Messages:
    7,483
    Joined:
    Feb 25, 2007
    Location:
    Midwest USA
    Shooter:
    Multi Format
    Yes, any shop that is making 39mm Whitworth threads :D So, on this continent that would probably be SK Grimes....
     
  13. Jim Jones

    Jim Jones Subscriber

    Messages:
    2,429
    Joined:
    Jan 16, 2006
    Location:
    Rural NW MO
    Shooter:
    Multi Format
  14. Bob-D659

    Bob-D659 Member

    Messages:
    1,300
    Joined:
    Feb 10, 2008
    Location:
    Winnipeg, Ca
    Shooter:
    Multi Format
    A 39x1 mm ring will jam. :sad:
     
  15. MartinP

    MartinP Member

    Messages:
    1,487
    Joined:
    Jun 23, 2007
    Location:
    Netherlands
    Shooter:
    35mm
    Ooooo, it seems that the Leica thread is indeed not a Metric one. I vaguely recall reading about the FSU pre-war thread vs. Leica difference, but didn't appreciate the reason.

    Strangely the Wiki article is a bit wrong too, or at least misleading. The Leica thread seems to be British Standard Fine (BSF), which is one of the Whitworth family but not the 'standard' thread pattern. The normal Whitworth thread is very robust (a relatively heavy coarse pitch/profile) and can withstand a lot of corrosion before jamming unuseably.

    Quarter-inch Whitworth bolts used to be used for all sorts of garden and farm tasks in UK. I'm English (though I don't live there anymore) and recall when the vendors started selling 6mm Metric bolts to replace the 1/4" W it was quickly found that Metric Coarse was a better match for the functionality of the Whitworth design, though arguably not quite as robust.

    You could say that the standard Whitworth thread was more like Metric Coarse, while the standard Metric thread was somewhat similar in design to B.S.F. It stretches my memory a bit, but I think I recall that there was a very fine instrumentation-purposes thread as well. Luckily Leica didn't borrow that one, else we'd never get an over-tightened lens off - clearly they knew what they were doing!
     
  16. John Koehrer

    John Koehrer Subscriber

    Messages:
    6,423
    Joined:
    Apr 3, 2004
    Location:
    Montgomery,
    Shooter:
    Multi Format
    nut(s)

    pm your address & I'll throw a Leica/Nikon/Minolta 39mm nut in the mail for you.
    Postage should run about a buck.