90 mm Apo-Rodagon

Discussion in 'Darkroom Developing and Printing' started by JCJeski, Nov 15, 2003.

  1. JCJeski

    JCJeski Guest

    I'm looking at buying a used 90 mm. Serial #10319867

    Can Bob Salomon tell me when this was manufactured?

    Is there two different apo-rodagon lenses, an "N" version and an non-"N"

    In the group's opinion, could I use the 90mm f4 for 6X4.5 enlarging to 20X24?
    (using a Saunders XLG enlarger).


    JCJeski, Nov 15, 2003
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  2. According to the serial number list published in View
    Camera magazine the lens was made between 1976 (10,000,000)
    and 1984 (10,500,000)
    Since serial numbers may be issued in blocks, and since
    the production of lenses may not be constant, its not
    possible to get a more exact date from this.
    The diagonal of 6cm x 4.5cm is 75mm so this lens will more
    than cover it but will not make large prints unless the
    enlarger has an extended column. It should cover 6cm x 7cm
    quite nicely.
    For large prints a 75mm or 80mm lens would be more
    suitable. I don't know about the N version. Rodenstock makes
    some enlarger lenses optimized for large magnification
    ratios. The advantage of these is that they are somewhat
    sharper at larger f/stops than the standard lens. Since
    light is at a premium when making very large prints this is
    a distinct advantage.
    Richard Knoppow, Nov 15, 2003
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  3. JCJeski

    Mark A Guest

    These are the different Rodagons that are available today. The language
    below is from the Rodenstock German website.
    http://www.rodenstockoptics.de/pg3.html Don't know if it was any different
    20 years ago.

    RODAGON: Known as the "universal workhorse," the Rodagon offers brilliant
    reproduction over a wide range of enlargement ratios. With a six-element
    design, the Rodagon provides resolution of the finest details while
    maintaining a uniformly high contrast on axis to field edge.

    RODAGON-WA: Designed for smaller, awkward areas, the Rodagon-WA has a
    shorter focal length and a large angle of view, and achieves a 70% larger
    projection area than with standard focal lengths.

    APO-RODAGON-N: For the most demanding applications, the Apo-Rodagon-N is an
    apochromatically-corrected, high performance lens that guarantees perfect
    results. It ensures the elimination of visible color fringes on high
    contrast borders, and is a preferred lens for B&W imaging applications.

    RODAGON-G: For extremely large reproduction scales, the Rodagon-G is your
    best choice. This lens series surpasses the quality of all conventional
    enlarging lenses of this type.

    APO-RODAGON-D: Ideal for duplication work, macro photography and CCD
    cameras, the Apo-Rodagon-D lens is designed for scales of 0.4X to 2.5X. It
    offers superior duplication with practically no loss in quality.
    Mark A, Nov 16, 2003
  4. I concur with Richard... For 20" x 24" prints I recommend an 80mm lens... I
    have both the 80mm f:4 and the 105mm f:5.6 Rodagons and the 105 will have to
    be way up in the air for a 9X enlargement... If you can turn the enlarger
    and wall project or raise the enlarger towards the ceiling and floor
    project, then the 105 will do the job, though focusing may be tricky...
    Otherwise a 75- 80 is your best bet...

    Dennis O'Connor, Nov 16, 2003
  5. The Apo-Rodagon (without "N") is the older version (1980's), the Apo-Rodagon N
    is the current design. From Rodenstock Munich I got the information that
    both are optically identical, but the barrel differs. Bob Salomon will tell you
    different. I couldn't see _any_ differences between my 4/90 Apo-Rodagon and
    a loaned Apo-Rodagon N 4/90 (enlarging 6x7 negs with f8 to 40x50cm), so I kept
    my older lens and didn't buy a new one.

    I don't know this enlarger, but if the column is high enough, it will work. If
    it isn't, buy a shorter lens (80mm is fine).

    Martin Jangowski, Nov 17, 2003
  6. JCJeski

    Bob Salomon Guest

    Martin, There are many differences not the least the N is multi-coated
    with far reduced flare and greatly increased contrast and color
    saturation. Then there is the different construction.
    Bob Salomon, Nov 17, 2003
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