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  1. #1

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    Need serious help! 4x5

    So I went to use my favorite enlarger today at the darkroom. (Omega Universal 4x5)

    It's got a lens turret set up with a Rodagon 135mm 5.6 and a few other lenses.

    I've always used it to enlarge big prints with my 35mm and medium format negs, but when I went to go enlarge my 4x5 negs (new to 4x5 btw) there was serious vignetting making the image unable to print.

    It SEEMS like the lens doesn't cover the whole 4x5 negative. (You can see of the neg in the vignetting portion.)

    The manager there says he is going to look into getting a "4x5" lens, but it seems strange that that lens doesn't work.

    Anyone have a clue?

  2. #2
    Thomas Bertilsson's Avatar
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    Do you have the correct condenser (or condenser position) and/or bellows / lens cone?
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  3. #3
    rthomas's Avatar
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    Sounds like a condenser issue; the 135mm Rodagon should be fine for 4x5 printing. There should be a condenser lens in a housing above the negative stage, with a door that swings up so you can reposition the condenser. This door has a diagram on the inside that shows the position of the condenser for specific focal lengths.
    “For me, the camera is a sketch book, an instrument of intuition and spontaneity.”
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  4. #4

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    Quote Originally Posted by Thomas Bertilsson View Post
    Do you have the correct condenser (or condenser position) and/or bellows / lens cone?
    I'm not sure.

    The condenser covers the entire 4x5 neg, but there could be some fall off. I'm not sure about the bellows.

  5. #5

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    Quote Originally Posted by rthomas View Post
    Sounds like a condenser issue; the 135mm Rodagon should be fine for 4x5 printing. There should be a condenser lens in a housing above the negative stage, with a door that swings up so you can reposition the condenser. This door has a diagram on the inside that shows the position of the condenser for specific focal lengths.
    Let me see if I can find a manual.

  6. #6
    Thomas Bertilsson's Avatar
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    Quote Originally Posted by rthomas View Post
    Sounds like a condenser issue; the 135mm Rodagon should be fine for 4x5 printing. There should be a condenser lens in a housing above the negative stage, with a door that swings up so you can reposition the condenser. This door has a diagram on the inside that shows the position of the condenser for specific focal lengths.
    That's very well explained.
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  7. #7

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    I pulled the condenser lenses out today and didn't see a whole lot. (Though, I didn't really know what I was looking for.)

    I'll do some more digging tomorrow.

  8. #8
    rthomas's Avatar
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    This is a diagram taken from the Omega D2 manual: Attachment 53491

    I'm not certain this is what you have but as the diagram shows you want the condenser lens at the top of the housing for a 135mm lens. If you've been printing 35mm the condenser is probably at the bottom. Hope this helps!
    “For me, the camera is a sketch book, an instrument of intuition and spontaneity.”
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  9. #9
    David A. Goldfarb's Avatar
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    I agree that it's a condenser issue. If you didn't have enough bellows or a long enough lens cone, you wouldn't be able to focus. A 135mm Rodagon should be able to cover 4x5". So the condensers need to be set to cover the full 4x5" neg.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  10. #10

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    Quote Originally Posted by rthomas View Post
    This is a diagram taken from the Omega D2 manual: Attachment 53491

    I'm not certain this is what you have but as the diagram shows you want the condenser lens at the top of the housing for a 135mm lens. If you've been printing 35mm the condenser is probably at the bottom. Hope this helps!

    Ah! I remember seeing that. (upside down bowl.) If I remember correctly, it was pretty far down.

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