Neeew guy setting up 1st darkroom - Omega enlarger calibration question(s)

Discussion in 'Darkroom Developing and Printing' started by Tim Breen, Jul 9, 2004.

  1. Tim Breen

    Tim Breen Guest

    HI folks,

    Omega D2V (sngl lens mount) and D5XL (turret), both wall mounted with
    enlarger(s) base plate now 6 3/8" above bench surface.

    It didn't occur to me during design of the darkroom but this (now,
    obviously) affects focal plane (right term?) as the original distance
    from neg stage to easel stage has increased by aformentioned amount.

    Additionally the minimum size of the enlargement is impacted (become
    larger) because I can't lower the head as close to the easel as I
    could before, due to the head hitting the lower "stops" on the rails,
    they're now being 6+ inches off the bench surface.

    In order to print smaller images should I

    a: I shim the lens, using longer throw lens mounts
    or
    b: use a longer focal length lens,
    or
    c: either because it doesn't it matter as long as I can registe and
    focus the full-frame or cropped image size I'm after?
    or
    d: neither because of something else I need to do 1st, and hadn't
    thought of.

    Also, isnt corner-to-corner light-loss a potential issue here too?)

    Lastly, is there anybody out there - close to Bend, Oregon - who I
    can schedual an appointmet with for you to come to my lab and help
    me/show me how to calibrate these enlargers. Paid help, of course.

    Thank you!

    Tim
     
    Tim Breen, Jul 9, 2004
    #1
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  2. Hi Tim,

    How about putting together a "bench" top that is capable of being raised
    or lowered by rack and pinion movement, so that you can close the
    distance or open it as required? When I was considering wall mounting
    my Omega that is what I planned to do. (Never did wall mount it.)


    Francis A. Miniter
     
    Francis A. Miniter, Jul 9, 2004
    #2
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  3. You didn't mention what optics you own but the turret makes me assume
    you have multiple lenses to choose from. I would simply use a longer
    focal length. This should cover most situations and you could always
    contact print your 4X5's. I always appreciate the added working space
    that this allows anyway. A plumb and square riser will work for those
    oddball combinations, too.

    There are many good ways to equip yourself for enlarger alignment. In
    the absence of engineered equipment, you can get a good start on
    alignment by use of a level and see that your easel surface is in
    registration to your enlarging lens and film stage. For a quick
    check, you can etch some fine lines with a razor blade onto a dark
    negative (film end, etc) and do some test enlargements. Simply check
    to see that they are in sharp focus and the same in appearance at the
    four corners. I can't recall the alignment adjustment points on the
    Omegas but they are usually quite obvious with a bit of inspection.
    If you're way off, it might be easier to shim your wall bracket but my
    guess is that you'll be able to use the enlarger adjustments.



    Craig Schroeder
    craig nospam craigschroeder com

    -Eschew Obfuscation-
     
    Craig Schroeder, Jul 9, 2004
    #3
  4. Tim Breen

    Mike King Guest

    Those times I needed to make smaller prints and couldn't get the head any
    lower I raised the easel. I just stacked paper boxes until I got the easel
    where I wanted it. With enough bellows extension or shorter f.l. lenses you
    can make reductions this way. You can also switch (within limits) to a
    longer f.l. lens and make smaller prints at the minimum elevation of your
    rig.
     
    Mike King, Jul 10, 2004
    #4
  5. Tim Breen

    RWatson767 Guest

    Tim
    Be sure to install a wall brace with your wall mount.
    Use a box or something to raise the easel for small prints. Or a longer lens.

    Bob AZ
     
    RWatson767, Jul 11, 2004
    #5
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