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  1. #1
    digiconvert's Avatar
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    Help with enlarger light distribution

    Some replies to my post on the selenium intensified neg have suggested that I have a 'cold spot' in the corners of my enlarger. I have looked at this and find something akin to vignetting on the top corners (see attached-phonecams do have a use !) I use an 80mm lens (Nikor) so do not believe this to be a problem and have taken the condensor out, cleaned it, tried it upside down etc. to see if something is amis but no improvement. Given that the Axomat is a very simple enlarger the only other possibility is the bulb which is in it. It's probably a small globe household bulb.
    Any ideas PLEASE ?
    Attached Thumbnails Attached Thumbnails DSC00032.JPG  
    Hmm- Wonder if she'd notice if I bought that :)

  2. #2
    billschwab's Avatar
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    Ah... just as I thought. Is this projected through your negative carrier? Is there a way to adjust the condenser Chris?

    B.

  3. #3
    digiconvert's Avatar
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    Quote Originally Posted by billschwab View Post
    Ah... just as I thought. Is this projected through your negative carrier? Is there a way to adjust the condenser Chris?

    B.
    Yes through the carrier (It's the same without). As far as I can tell the condensor is just one big lens (about 2" deep in a steel case) I thought perhaps one way up for 35mm one way for 120 but that didn't work-I have also tried a different condensor from a beat up Axomat from college , same result.

    Maybe I'm going to have to live with this until my printing is good enough to persuade my dearest that a nice s/h De Vere is really more important than a new stair carpet

    Cheers for any advice - and your time.
    Hmm- Wonder if she'd notice if I bought that :)

  4. #4
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    Is it vignetting in the other two corners as well? If it is not, you may be able to find a way to move the lens/enlarger center in relation to the baseboard.

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    Jerevan's Avatar
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    Could be the bulb itself. Get one that's made for enlargers. There are two different kinds, depending on how the bulb is placed in the enlarger (vertical or horisontal). The light is directed in different ways depending on how it sits. And check to get the right wattage, too. Sometimes the bulb socket can be shifted (my Durst works that way) so it is centered.
    “Do your work, then step back. The only path to serenity.” - Lao Tzu

  6. #6
    Ole
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    It could be the bulb... If the bulb is in the wrong position and/or the wrong size, this is exactly what you would get. I've tested a lot of bulbs to find a viable alternative in my L138S - no success so far. But I do have one bulv which I'm keeping for negatives shot with far too wide lenses with lots and lots of light falloff...
    -- Ole Tjugen, Luddite Elitist
    Norway

  7. #7
    JBrunner's Avatar
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    Quote Originally Posted by Ole View Post
    It could be the bulb... If the bulb is in the wrong position and/or the wrong size, this is exactly what you would get. I've tested a lot of bulbs to find a viable alternative in my L138S - no success so far. But I do have one bulv which I'm keeping for negatives shot with far too wide lenses with lots and lots of light falloff...
    I would defer my advice to Ole's. I believe his advice is more on target.

  8. #8
    digiconvert's Avatar
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    Quote Originally Posted by JBrunner View Post
    I would defer my advice to Ole's. I believe his advice is more on target.
    I've tried every way to get the head to move relative to the bulb and v/v but no luck so I suspect a new bulb is my next step- shame I'd got the sob story all ready "and I may as well get an enlarger that will do 4 x 5 in case I get into that" followed by "Now I've got a 4x5 enlarger I may as well get an LF camera dear"

    Mind you the bulb is probably cheaper.

    Thanks to all who have replied, this really is a fantastic place

    Cheers CJB
    Hmm- Wonder if she'd notice if I bought that :)

  9. #9

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    I did a quick check on-line and found the previous posts might have nailed down your problem.
    Your problem could lay in a misaligned condenser or lamp.And make sure you have the correct bulb for your specific enlarger.

    Mike

  10. #10
    digiconvert's Avatar
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    Anyone know the right lamp for a Meopta Opemus 5A ? No luck so far in my searches.
    Hmm- Wonder if she'd notice if I bought that :)

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