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Thread: Petzval?

  1. #1

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    Petzval?

    Hello everybody!
    First of all I'm sorry if my English is not perfect.
    I have a question. Here - the Petzval formula:
    http://www.apug.org/forums/attachmen...7&d=1122119230
    Here - the formula of the lens I'm interested in, it is Steihel's Portrait Antiplanat ( Antiplanet?)
    http://www.apug.org/forums/attachmen...8&d=1122119230
    Does someone have experience with this lens? I need a lens, with will give the exact Petzval type image - very sharp in the center with soft corners and nice bokeh. I don't need one of the "soft" portrait lenses, which don't give sharp picture at all (like Imagon, Verito etc.). I'm also interested in a short and relatively small Petzval - I'm going to mount it
    on my Pentax-67 via helicoid macro tube ( as I successfully did with 150mm Heliar). The Antiplanat has small rear element and it is nice because it will be easier to mount on the helicoid. But will it give me the exact Petcval-type character of the image?!

  2. #2
    JG Motamedi's Avatar
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    The Portrait Antiplanets are pretty rare and I have never seen one except on a collector's shelf (unused, sadly).

    According Kingslake these were a modified version of the Petzval Portrait, but to me they look more like Petzval's Orthostigmat (another rare lens). From what I recall, they have a similar inward coma, so they should retain the sharp middle and fuzzy corners as the Petzval.

    If you do buy the lens please post images! I would love to see what these lenses produce. If you don't buy it, please let me know who is selling it...

  3. #3

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    Here's a short one I'm selling currently. I've used it on both my Pentax 67 and my Rollei SL66.

    William

    http://cgi.ebay.com/ws/eBayISAPI.dll...4083&rd=1&rd=1
    "Since the fact that we exist at all is nothing more than banal, we might just as well make something grand out of it …"

    Francis Bacon


    http://www.williamlinne.com

  4. #4

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    William, from the E-bay pictures it is not clear - does this short Petzval (75 mm? - super short!) able to produce pictures with sharp middle area? Was the coverage enough for 6x7? BTW - is it written on the body that it is a Petzval lens or did you disassemble the lens to check its formula?

  5. #5

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    Hi Mikhail,

    Yes, the scans I made are really bad. The center area is sharp. It does indeed cover 6x7 with the characteristic petzval center sharpness and dramatic curvatire of field. I counted the reflections to determine whether or not it's a petzval and I could tell by just looking through it. I've used a petzval or two in my day.

    thanks,

    William
    "Since the fact that we exist at all is nothing more than banal, we might just as well make something grand out of it …"

    Francis Bacon


    http://www.williamlinne.com

  6. #6

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    I have possibly a similar lens, it is a Steinheil-Munchen Othostigmat f6.8 12cm in a Koilos shutter. Can anyone shed some light on this lens? Is it a Petzval? It's two lenses look like ((___)). Any assistance is appreciated. Thanks. Jon
    Everyone has a constitutional right to be an idiot; that does not mean you should exercise your right!

  7. #7

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    Assuming this lens has 4 elements and they are ((____)), then my Othostigmat lens would be a rapid rectilinear lens!?? correct? Any thoughts on its coverage? Thanks. Jon
    Everyone has a constitutional right to be an idiot; that does not mean you should exercise your right!

  8. #8

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    http://dioptrique.info/base/m/m_steinheil.htm

    You can find out much more at this site. They also did tests on some of the lenses, including pictures showing some performance characteristics.

    My feeling is that if you want a Petzval look, you should be using a Petzval type lens. That could be a 1/4 plate lens, like the Holmes, Booth & Haydens I use, or something later like the Gundlach projector lens made for Simplex 35mm motion picture cameras. The Gundlach is much smaller than a 1/4 plate lens, yet will cover 6x7 (cm). I have a Gundlach, which is a Petzval design, but I do not have a flange for it.

    Ciao!

    Gordon Moat Photography

  9. #9
    Murray@uptowngallery's Avatar
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    Jim Galli keeps coming up with small Petzvals for about US$85.
    Murray

  10. #10

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    Quote Originally Posted by HerrBremerhaven View Post
    http://dioptrique.info/base/m/m_steinheil.htm

    You can find out much more at this site. They also did tests on some of the lenses, including pictures showing some performance characteristics.

    <snip>

    Ciao!

    Gordon Moat Photography
    Gordon, I like Eric's site. We're acquainted, by e-mail, and I count him a friend.

    But the diagrams and charts he publishes aren't empirical, they're calculated from the lenses' prescriptions. He wrote the program, '030', that did the calculations. If you look around on the site, you should find a link for downloading it and documentation.

    Cheers,

    Dan

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