troubles enlarging 35mm photograph. help very much appreciated

Discussion in 'The Darkroom' started by kimclarkson10, Mar 8, 2009.

  1. kimclarkson10

    kimclarkson10 TPF Noob!

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    Dear all

    I have recently set up a dark room in my house. I have a JPL colour enlarger C7700. It should be able to print 35mm and 120mm film. I am having no troubles with the 120 prints as I am using a 80mm lens (I think - it does not say on lens) but I know that it is fine on 120. However I am trying to print a 35mm picture and have changed the lens to the standerd 50mm. However the print only allows it to be around 10cm by 7cm and if I attempt to make it any larger it blurs out of focus and I am unable to make it in focas. It works with the 120 lens but the largest I can blow it up to is A4 and I want to blow it up to A2. Is this a condenser problem? If so how do I adapt it to make it work? Or is the problem with the lens? The man I bought it said this was the correct lens.

    Any help from fellow traditionalists would be very much appreciated.

    Thank you - Kim :thumbup:
     
  2. compur

    compur No longer a newbie, moving up!

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    Changing size is done with one control and focus is done with another.

    The control that raises and lowers the entire enlarger head is the one for
    changing print size.

    The control that moves the negative stage closer to or further away from the
    light source is the focus.
     
  3. kimclarkson10

    kimclarkson10 TPF Noob!

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    hello - I have tryed this - but still no joy - is it anything to do with the condensor?

    thank you
     
  4. ann

    ann No longer a newbie, moving up!

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    i hesitated to respond the first time around as i am not familar with that specific enlarger.

    however, since you mentioned consendors, that could be an issue.
    does this enlarger have a mixing chamber that needs to be changed when changing format size.
    also, do you have to change the negative stage height when changing format and last perphas the 50mm lens needs a reverse board.

    how about the fellow who sold you the enlarger, can he be more specific.

    sorry i can't be more helpful.
     
  5. ann

    ann No longer a newbie, moving up!

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    ps.

    i thought i would google a bit and see if i could find a photo of this enlarger that might help

    i did find this right away, which might be helpful

    LPL Instruction Manuals
     
  6. Dwig

    Dwig TPF Noob!

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    If you can raise the enlarger's head far enough, which you should with this enlarger, but can't get the lens to focus then:

    1. it is not a condensor issue. The wrong condensors and/or mis-placement of the condensors will not affect the image focus; it will only affect the eveness of the illumination, possibly leaving the corners completely dark.

    2. your enlarger probably requires that short FL lenses (e.g. 50mm) be mounted on recessed lens boards so that they can be retracted close enough to the negative to allow for proper focus when the head is high on the column.

    Given that the longer lens (75mm, 80mm, ... ?) focuses at any head position and the shorter 50mm lens focuses well at lower head positions and not at high positions, its most likely that you are using an inappropriate lens board for the 50mm lens. I'm not directly familiar with your model enlarger, but those of similar design that I've been in contact with all required a slightly recessed lens board for 50mm lenses.
     
  7. Paul Ron

    Paul Ron TPF Noob!

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    You are using the wrong enlarging lens. 80mm is for 645, 6x6 n 6x7. Get a 50mm enlarging lens for 35mm negs. Also chaning the lens will require an adjustment to the condensers as well. Check the manual for your enlarger n see if you either need to change the condenser or adjust it.
     
  8. ann

    ann No longer a newbie, moving up!

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    they are changing the lens , it is the 50mm with the 35mm negatives that are the issue.

    it seems strange that the lens didn't come with a recessed board, but there are stranger things happening these days with equipment.
     
  9. Paul Ron

    Paul Ron TPF Noob!

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    Well I'm not familiar with that enlarger but in general on most enlargers like my Besseler 23C, if you change the lens, you need to adjsut or change the condensor or you'll wind up with exactly what is happening here.

    ummm.... since it is a color head, it's probably a diffuser n doesn't need adjusting so the resesed lens mount makes perfect sence.
     
  10. ann

    ann No longer a newbie, moving up!

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    i went hunting around and found some photos of that enlarger and unlike the beseler's one does not move the condensor head. If is fixed.

    with these types of enlargers it is not uncommon to switch out the mixing chamber.

    however, a large mixing chamber should work with a 50mm lens.

    since seeing the head, i am leaning along with someone else that the lens board needs to be reversed.

    Hopefully, finding a manual will help the OP.
     
  11. Dwig

    Dwig TPF Noob!

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    No, failure to adjust the condensors on a 23c will not cause focus issues. It will produce uneven illumination.

    Since the enlarger in question uses a diffusion "mixing chamber", common in modern color heads, there is no condensor issue of any kind. Its strickly a matter of not being able to move the lens close enough to the negative to focus properly at the higher head positions. Either something is blocking the travel of the front standard or the wrong lens board is being used.
     
  12. Early

    Early TPF Noob!

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    I doubt these enlargers (made by Saunders) even have a board. The lenses merely screw into the base.
     

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