illuminated F/stop dial on my 50mm APO Rodagon N.

Discussion in 'Darkroom Developing and Printing' started by theyankeesnapper, Nov 27, 2005.

  1. The illuminated dial on my Rodagon is not illuminating the F/stops when
    used on either my durst M605 B&W, or my LPL 670 when I'm doing 35mm. Is
    there an adjustment or slide I'm not seeing? It never bothered me until
    I was at the B&H website and was looking at this lenses spec's. Am I
    missing something other than the illuminating F/stop's?


    Bob McCarthy
    theyankeesnapper, Nov 27, 2005
    1. Advertisements

  2. theyankeesnapper

    John Guest

    I might be wrong but I don't think all of the Rodagons are illuminated. I
    think this was an improvement that was implemented in the last 10 years.



    John S. Douglas, Photographer & Webmaster -
    John, Nov 27, 2005
    1. Advertisements

  3. theyankeesnapper

    Mike King Guest

    In my recollection, illuminated stops use enlarger light from around the
    perimeter of the lens, look at the back of your lens you may see a small
    clear lens, port or hole that is the entry point for the light that is used
    to illuminate the stops, if the design of your enlarger is too efficient
    (think "Durst" masking carriers etc.) about masking off non-image forming
    light (aka "fog") the stops may not be getting any light. Other designs may
    use other ways to get the light to the aperture ring, light from outside the
    image circle perhaps but with some enlargers again there just isn't much
    "spare" light.
    Mike King, Nov 27, 2005
  4. theyankeesnapper

    Bob Salomon Guest

    The small rectangular port on the rear surface of your lens is closed
    off either by a piece of tape - if the lens had been used for macro or
    reversed, or by the lens flange.

    The only other reason was your buying a used lens that was scavanged
    from some type of scanner for industrial applications. Those versions
    did not have the illuminated aperture or the pre-set aperture control or
    the dis-engageable click stops.
    Bob Salomon, Nov 27, 2005
  5. On my 150mm Rodagon there is a plastic piece on the periphery of the
    rear element mount that needs to be illuminated. When the lens is
    in an adapter for use in a turret then light no longer gets to this
    piece and the aperture ring is dark.

    Take off the lens board and look from the rear: do you see the
    plastic thingy? You may be able to drill a hole or do some filing
    to let light in - with a thread adapter that option is out, though.

    #1) Get some rubylith and re-lens a penlight. #2) Pay someone
    to do #1 for you: Google for "penlight red" or "penlight safelight",
    "red flashlight" etc..

    I have the penlight tied to a string tied to the enlarger bench.
    Nicholas O. Lindan, Nov 28, 2005
  6. Hi:

    I bought this lens new about 10 years ago, APO-Rodagon N 50mm F2.8,
    serial #11217832.
    I can see the rectangular port and its clean and clear, could my lens
    be defective?


    Bob McCarthy
    theyankeesnapper, Nov 28, 2005
  7. theyankeesnapper

    John Guest

    APO ? Oh yeah it must be broken ah, eh, letsee, I'll give you $50 for it
    in light of the lack of light !


    Seriously, there must be something obstructing the light path.



    John S. Douglas, Photographer & Webmaster -
    John, Nov 28, 2005
  8. One of my lenses, not a Rodagon, has such a light, but so little light hits
    the window that it is useless. One of my Beseler lens boards has a light,
    too, but same problem.

    I just count clicks. Most lenses are 1 f-stop apart, but one lens is 1/2
    f-stop. Lots less bother.
    Jean-David Beyer, Nov 28, 2005
  9. theyankeesnapper

    John Guest

    I just leave mine set to one aperture unless I'm printing color. 2 stops
    down from wide open.



    John S. Douglas, Photographer & Webmaster -
    John, Nov 28, 2005
  10. theyankeesnapper

    seog Guest

    Exactly. It's basically a useless feature. It only "works" when you're
    making the exposure. What's the point?
    seog, Nov 28, 2005
  11. Focus, stop down, then turn off the enlarger?

    FWIW, I like the feature.
    Nicholas O. Lindan, Nov 29, 2005
  12. theyankeesnapper

    John Guest

    I don't have any problems seeing the digits on my Schneiders or my Nikkor.
    As stated previously, I don't change the apertures much anyway but I can
    always take a look at them in the dark and tell what the setting is.



    John S. Douglas, Photographer & Webmaster -
    John, Nov 29, 2005
  13. theyankeesnapper

    Mike King Guest

    I have a small AA flash that I do the same thing with, though I'm now
    lusting after a red LED penlight. The little Mag-Lites have a filter kit,
    not sure how "safe" the red filter in this kit is but for short periods it
    should do. The flashlight has one other advantage, an illuminated aperture
    ring is no help at all when you drop your pencil on the floor!
    Mike King, Nov 30, 2005
  14. theyankeesnapper

    Mike King Guest

    check for something in the enlarger that may be blocking the light from
    getting to the light port.
    Mike King, Nov 30, 2005
  15. theyankeesnapper

    Matt Clara Guest

    It depends on the density of your negative. Less dense negatives pass more
    light to the window. That's been my experience with my 80mm Rodagon on my
    Bessler 23c, anyway.
    Matt Clara, Nov 30, 2005
  16. theyankeesnapper

    Lloyd Erlick Guest

    February 11, 2006, from Lloyd Erlick,

    You know, this solves a problem for me.

    Lloyd Erlick Portraits, Toronto.
    voice: 416-686-0326
    Lloyd Erlick, Feb 11, 2006
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.