why can't i get a normal print size?!

Discussion in 'Darkroom Developing and Printing' started by tabby, Aug 6, 2006.

  1. tabby

    tabby Guest

    hi

    I have a durst m707 black and white enlarger. For some reason my image
    will only focus on the board smaller than 6x4. Am i doing something
    wrong or have i got a bad quality negative?

    i have tried the head in many different positions but just can't get an
    8x10 print. the person who had it before me didn't seem to have any
    problems.

    Can anyone help, please?
     
    tabby, Aug 6, 2006
    #1
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  2. tabby

    John Guest

    Hopefully {;>)

    First, welcome to the group.

    Second, we're probably going to need some more information to give you
    a definite answer. Here's a few questions:

    1) What format negatives are you enlarging ?
    2) What is the focal length of the lens you are using ?

    For 35mm negatives, a 50mm enlarging lens is considered
    "normal". Of course one can choose to use any focal length lens as
    long as it is capable of covering the complete negative at the desired
    magnification. For instance one would not use a short lens of 24mm as
    it will not completely cover the negative. I believe that Durst
    included the 75mm lens with the 707 just as they did with the 606. If
    that is the case then you are using too long of a lens. The 75mm lens
    is essentially 50% longer than the 50mm lens and therefore you need to
    raise the enlarger head that much more. You might also need to check
    and make sure that the condenser is installed correctly. I don't know
    if it can be installed upside down or not but that would certainly
    cause troubles.

    ==
    John S. Douglas
    Photographer & Webmaster
    Legacy-photo.com - Xs750.net
     
    John, Aug 6, 2006
    #2
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  3. Are you using the correct lens board for your chosen lens and film format?
    For 35mm negatives, you need the Siriotub 39 in which you screw the lens
    inside it (concave).
    For medium-format from 6x4.5 to 6x7, you need the Siriopla 39 lens board.
     
    Keith Tapscott, Aug 6, 2006
    #3
  4. tabby

    Alan Smithee Guest

    I've always used an 80mm or a 75mm on my Beseler MX-45. Does the lens vary
    somewhat on different enlarger platforms?
     
    Alan Smithee, Aug 6, 2006
    #4
  5. tabby

    Greg \_\ Guest

    Nope, 50 is considered normal. However with a Longer lens you can print
    smaller prints further away....which does make burning and dodging
    possible for smaller size prints.
     
    Greg \_\, Aug 7, 2006
    #5
  6. A longer than "normal" lens has the advantage that light
    fall off is reduced. The limiting factor is the distance one
    can get the head from the paper. I sometimes use a 100mm
    lens for enlarging 6x6 negatives but for 4x5 I am reduced to
    using 135mm and routinely burning the corners.
    As to the original poster's problem I suspect some
    information is missing.
     
    Richard Knoppow, Aug 7, 2006
    #6
  7. tabby

    Alan Smithee Guest

    It almost sounds like you aren't adjusting the bellows, but only raising and
    lower the head unit to make enlargement.
     
    Alan Smithee, Aug 7, 2006
    #7
  8. I have a Durst Modular 70 which is very similar to the Durst M707 and some
    of the accessories are interchangable. Tabby must use the correct lens board
    to be able to focus properly.
    I have already pointed this out in my first post.
     
    Keith Tapscott, Aug 7, 2006
    #8
  9. tabby

    tabby Guest

    hello again!

    Thank you for helping me........sorry i should have said before, i am
    enlarging 35mm negs and i am using a 50mm lens (nikon).

    i'm pretty sure my condenser lens is fine. My lens board is recessed
    side up and the bellows are as close to the neg as possible. i can now
    get a 5x7 print! i'm beginning to think that maybe the lens board that
    came with it isn't right for 35mm. i will check this out.
     
    tabby, Aug 7, 2006
    #9
  10. tabby

    tabby Guest

    ah! i am trying to enlarge 35mm negs and i have the siriopla lens
    board. This must be the problem. thank you very much......i would never
    have figured that one out!
     
    tabby, Aug 7, 2006
    #10
  11. It sounds like you are using the correct lensboard. Are you as Alan
    suggested, just moving the head up and down the column or are you also using
    the focusing wheel on the right hand side of the enlarger which retracts and
    extends the focusing bellows?
     
    Keith Tapscott, Aug 7, 2006
    #11
  12. The Siriopla is the flatter of the two which takes enlarger lenses from
    about 75mm to 105mm depending on which medium format you are enlarging. The
    Siriotub is the concave one which you place the 50mm lens inside of to screw
    in the thread.
    My second post (last sentence) may have sounded rather abrupt which it
    wasn`t meant to, my apologies to Alan is it sounded this way.
     
    Keith Tapscott, Aug 7, 2006
    #12
  13. tabby

    tabby Guest

    you were right the first time i think. i have the siriopla but i need
    the siriotub!

    ......and just to confirm, i am using the focusing wheel as well as
    moving the head. i think the problem is that i cant get the lens close
    enough to the neg and hence i need the more concave lensboard.......

    thanks
     
    tabby, Aug 7, 2006
    #13
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