adapt M39 to M25?

Discussion in 'Darkroom Developing and Printing' started by Luigi de Guzman, Mar 3, 2004.

  1. I have a Durst M606 whose lensboards are treaded for M25 lenses; I
    would like to be able to use a newer M39 lens on my enlarger.

    Are step-down rings from 39mm to 25mm available, and where can they be
    found?

    -luigi
     
    Luigi de Guzman, Mar 3, 2004
    #1
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  2. : I have a Durst M606 whose lensboards are treaded for M25 lenses; I
    : would like to be able to use a newer M39 lens on my enlarger.

    : Are step-down rings from 39mm to 25mm available, and where can they be
    : found?

    : -luigi

    I have a Durst M600 and faced the same issue. The short answer is that
    there are no rings that allow you to use M39 lenses on lensboards
    threaded for M25 lens. (There is an adapter that lets you use an M25
    lens in a M39 board, but that's not what you are trying to do.)

    You have two choices if you want to use M39 lenses: 1) you can try to
    find an M39 lens board that will fit your enlarger. These show up on eBay
    for the M600 with some regularity, but you might have to wait several
    weeks for one. Then you have to hope that no one else in you situation
    needs the adapter. 2) You can go to a machinist and have the current lens
    board enlarged, then threaded for M39.

    Schneider still makes a Componon-S 50mm lens in the 25mm mount, if you
    want to stay with the M25 lens board. (Older Schneider Componons in
    M25 mounts show up on eBay with some regularity, especially the f4
    50mm lens. A good example of this lens will be a competent performer.)

    Warren B. Hapke
     
    Warren B. Hapke, Mar 3, 2004
    #2
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  3. Luigi de Guzman

    jjs Guest

    Can you have a new board made? If it's just a flat board, then it's stone
    simple to drill a new hole.
     
    jjs, Mar 4, 2004
    #3
  4. Luigi de Guzman

    jjs Guest

    jjs, Mar 4, 2004
    #4
  5. UPDATE.

    An e-mail to SRBFilm in Luton (www.srbfilm.co.uk) has informed me that
    my only realistic option is to send my lensboard to them to be
    re-bored and re-threaded.

    **sigh**

    it looks like I'm going to have to wait for an M25 lens to come my
    way--Schneider still makes them, but there's none under US$350
    according to a cursory search.

    The only other thought is this: how interchangeable are later Durst
    lensboards with my M606? I used M670's while I was at university, and
    seemed to remember that the lensboards were metal, threaded, and
    round. If I could replace one of those for my present lensboard, I'd
    be in business.

    For now I'm making do with the old 50mm f/4.5 lens that came with the
    enlarger, but as I bought it to enlarge from 6x6 negatives as well,
    I'm a bit down....

    -Luigi
     
    Luigi de Guzman, Mar 4, 2004
    #5
  6. Just a speculative thought--sorry I don't have a definitive answer--but
    wouldn't it be possible to cobble up your own lensboard out of thin material,
    say thin plywood or wood-composition board? Unless there's some kind of flange
    around the edge, seems like this should be do-able. So far as the threaded
    lens mount goes, maybe you could use a lens retaining ring?


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    David Nebenzahl, Mar 4, 2004
    #6
  7. the lensboard is round, recessed somewhat, and has a flange which
    grabs a set-screw, and made of metal. It's also very thin.
     
    Luigi de Guzman, Mar 4, 2004
    #7
  8. Luigi de Guzman

    BertS Guest

    Try http://www.cambridgeworld.com/durst_old.htm and search. That is where I
    got one for my M600.

    If they have one listed send them an e-mail. The list you see if poorly
    maintained and they may not have something listed in stock. On the other hand
    they may have something not listed.

    You will need to ask for their stock number, not the Durst part number.

    Cost should be around $25 + S&H.

    I have a lens board that does not fit my M600, it is bigger. Measure yours,
    in millimeters and I will check if mine is for the M606. It is marked "Durst
    Lapla 39".

    Unmunge my e-mail address and respond via e-mail. aasainz at ix period netcom
    period com.

    Bert
     
    BertS, Mar 4, 2004
    #8
  9. Luigi de Guzman

    Nick Zentena Guest


    Sounds like the Septola [I think] Still current. Measure and I'll compare
    to mine. I wouldn't call mine thin. How think do you mean?

    Nick
     
    Nick Zentena, Mar 4, 2004
    #9
  10. I can't measure very exactly, but it's about 82mm in diameter, & it's
    recessed a few mm.

    There's no part name on it anywhere....

    -Luigi
     
    Luigi de Guzman, Mar 4, 2004
    #10
  11. Luigi de Guzman

    Nick Zentena Guest


    If it's only recessed a little then it's not the one I'm thinking about.

    Try this:


    http://groups.google.ca/groups?hl=&rnum=3

    Also try emailing Jobo in the US. They handle the smaller Durst enlargers.
    I think from your description that the current boards should fit but better
    to ask. If you go to the B&H website they have a picture of the Siriotub and
    most of the other Durst boards. See if they look similar.

    Nick
     
    Nick Zentena, Mar 5, 2004
    #11
  12. Thanks for the URL and the hint. I've just e-mailed JOBO USA, and am
    awaiting an answer.

    I'm sorely tempted just to get the appropriate lensboard, but I'd be
    really annoyed if it happened just to be a few millimetres off...!

    Oh well. I can always start putting pennies in a jar for a new 80mm
    f/4 Componon-S. in M-25.

    -Luigi
     
    Luigi de Guzman, Mar 5, 2004
    #12
  13. Luigi de Guzman

    Mike King Guest

    Lapla is M601, M605 and (probably)M670 and M70
     
    Mike King, Mar 5, 2004
    #13
  14. Yes, but has anyone yet tried it on the M606???

    If it should work, then I'm in business!

    -Luigi
     
    Luigi de Guzman, Mar 5, 2004
    #14
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