enlarger lens for Omega Prolab 4x5

Discussion in 'Darkroom Equipment' started by Cheryl Jacobs, Jan 2, 2008.

  1. Cheryl Jacobs

    Cheryl Jacobs Member

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    Hey, all -

    I've got an Omega Prolab 4x5 enlarger (70" column) that I've not used yet. It's been waiting for a lens so I can start printing the 4x5 negs I've been amassing.

    I did some googling and have searched APUG, and from what I've seen, people are successfully using a Componon 135mm lens with good coverage for 4x5. I've just tried that lens (both an older model and a new one) and I still have a definite lack of coverage. I'm not sure why the 135 works for others and not for me.

    I know that the natural lens for enlarging 4x5 is a 150mm. I just want to be sure that the 150 will resolve the problem before attempting to find and pay for one.

    My apologies if this is an ignorant question, or if I haven't included sufficient information. I've done plenty of printing in my time, but I've only ever used one enlarger, so I'm a bit novice where darkroom equipment is concerned. I've had the 4x5 enlarger for a few years now, and have never fired up the beast.

    Thanks in advance!

    - CJ
     
  2. Paul Howell

    Paul Howell Member

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    I did some googling and have searched APUG, and from what I've seen, people are successfully using a Componon 135mm lens with good coverage for 4x5. I've just tried that lens (both an older model and a new one) and I still have a definite lack of coverage. I'm not sure why the 135 works for others and not for me.

    I know that the natural lens for enlarging 4x5 is a 150mm. I just want to be sure that the 150 will resolve the problem before attempting to find and pay for one.

    I have several 135s, all have the same issues, I use a 162 Wollensak or a 150 Vivtair.
     
  3. JBrunner

    JBrunner Moderator Staff Member Moderator

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    My 135 Nikkor covers quite happily on my Chromega D, as well does a Wolly 135 Raptar. Is the condenser in the top slot?

    J
     
  4. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    Cheryl, do you have the lens turret on it? The lens that came with the enlarger turret was a Rodenstock (bottom line) Omegaron 135mm. I've had some issues with printing 4x5 negs with that lens, not getting coverage from corner to corner. I've had to burn in the corners every time which is a pain in the rear end every time to get it to look smooth.
    I've been looking for an upgrade too, but can't afford one yet.

    - Thomas
     
  5. Cheryl Jacobs

    Cheryl Jacobs Member

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    Heh heh. No, because I'm apparently not smart enough to think of that. Good Lord, I'm getting senile. Condenser is now in the top slot. I can still see some fall off in the corners, but obviously it's better. Think I'll still have to look for that 150, but at least I can play a bit with the 135.

    Thanks -

    - CJ
     
  6. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    Actually I think the condenser is supposed to be taken out of the top compartment when enlarging 4x5. From last time I used my ProLab I remember having a significant bellows draw for 4x5.

    - Thomas
     
  7. Cheryl Jacobs

    Cheryl Jacobs Member

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    Thomas, the instructions on the enlarger say the 135 should be on the top slot, and that the condenser should be removed for 150 and longer.

    - CJ
     
  8. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    I must have a 150mm lens then. Sorry for the confusion.

    - Thomas
     
  9. Dinesh

    Dinesh Subscriber

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    135 = top slot

    150 = remove completely
     
  10. r-brian

    r-brian Member

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    I've installed a variable condenser head on my old DII. The first time I used it with my 135 Rodagon, with the movable condenser in the 135 slot, I got major vignetting. I remove the removable condenser, which is what is appropriate for a 150mm lens, and everything was fine. I use both a 135mm lens (for 16x20's) and a 150mm (for 11x14's). I don't have enough column height to use the 135mm for 16x20's.
     
  11. Ronald Moravec

    Ronald Moravec Member

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    135 is for 3 1/4 x 4 1/4 negs. People get away with it for small prints because the lens is further from the neg.

    Condensers rather than diffusion makes it problematical also.

    Set your condensers for 4x5 or 150mm.

    It also depends on the exact lens. I use a 135 comparon on my D2 and it works as well as my 150.

    Condensers do not work well with any wide angle lens design. Do not buy one.
     
  12. JohnArs

    JohnArs Subscriber

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    Hi

    I also use my Nikkor 135 for my 4x5 but on a Jobo LPL 4551 diffusion, the Nikkon is a bit contrastier but at the last 4-5 mm at the corner the 150mm Rodagon is a tiny bit sharper but you need a loupe to see it!

    Armin Seeeholzer